Physics (Class 10)

Trishna Knowledge Systems

Chapter 1 Kinematics - all with Video Answers

Educators

Chapter Questions

01:12

Problem 1

Motion of an aeroplane is an example of ________ dimensional motion.

Darshan Maheshwari

Numerade Educator

01:56

Problem 2

Define maximum height.

Sachin Rao

Numerade Educator

04:05

A particle is projected up with a velocity of $\sqrt{29} \mathrm{~m} \mathrm{~s}^{-1}$ from the tower of height $10 \mathrm{~m}$. Its velocity on reaching the ground is ________ $\mathrm{m} \mathrm{s}^{-1}$

Yuva S

Numerade Educator

01:12

Problem 4

In a velocity time graph, the negative slope indicates ________

Prabhu Ramji

Numerade Educator

01:55

Problem 5

Define time of ascent and time of descent.

Ajay Singhal

Numerade Educator

02:20

Problem 6

A body is falling freely under gravity. The distances covered by it in the first, second and third seconds of its motion are in the ratio of ________

Nishant Kumar

Numerade Educator

00:19

Problem 7

The equations of motion are applicable only when the body moves with ________

Bobby Barnes

University of North Texas

02:09

Problem 8

A hollow iron ball and a solid iron ball are dropped from the same height. Which ball reaches the ground first?

Prabhu Ramji

Numerade Educator

01:59

Problem 9

Show that for a body the magnitude of velocity of projection in the upward direction is the same as the magnitude of velocity of the body on reaching the point of projection on its downward motion.

Manish Jain

Numerade Educator

00:27

Problem 10

. The sum of the time of ascent and the time of descent is called ________

Nidhi Singhi

Numerade Educator

01:07

Problem 11

What is acceleration due to gravity?

Narayan Hari

Numerade Educator

01:22

Problem 12

A stone is projected up with a velocity of $4.9 \mathrm{~m} \mathrm{~s}^{-1}$ from the top of tower and it reaches the ground after $3 \mathrm{~s}$. Then the height of that tower is ________

Dheeraj Sharma

Numerade Educator

02:58

Problem 13

Two balls are dropped from height $h_1$ and $h_2$ respectively. The ratio of their velocities on reaching the ground is ________

Prabhu Ramji

Numerade Educator

00:51

Problem 14

What is the acceleration of a body when it is projected vertically upwards?

Kara Merfeld

Numerade Educator

04:40

Problem 15

Two bodies of different masses $m_1$ and $m_2$ are dropped from two different heights $h_1$ and $h_2$. The ratio of the times taken by the two to reach the ground is ________

Muhammad Nawaz

Numerade Educator

08:08

Problem 16

If an object is thrown vertically up with a velocity of $19.6 \mathrm{~m} \mathrm{~s}^{-1}$, it strikes the ground after ________ s.

Melissa Munoz

Numerade Educator

00:30

Problem 17

Write the equations of motion for a body projected vertically downwards.

Mayukh Banik

Numerade Educator

01:50

Problem 18

If a body is projected horizontally from top of a building. In 2 second, it falls vertically through a distance of ________ $\mathrm{m} \cdot\left(\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}\right)$

Satpal Satpal

Numerade Educator

00:31

Problem 19

What is time of tlight?

Jayashree Behera

Numerade Educator

00:59

Problem 20

If two balls are thrown vertically upwards with the same velocity, what is the difference in the maximum height gained by them?

Stephen Zaffke

Numerade Educator

02:21

Problem 21

Deduce an expression for the maximum height reached by a body.

Donald Albin

Numerade Educator

02:21

Problem 21

Deduce an expression for the maximum height reached by a body.

Donald Albin

Numerade Educator

01:33

Problem 22

Obtain an expression for time of flight.

Veronica Santana

Numerade Educator

01:42

Problem 23

. Why does the velocity decrease when the body is projected upwards?

Surendra Kumar

Numerade Educator

02:31

Problem 24

Show that the time of ascent is equal to time of descent for a body projected vertically upward.

Melissa Walsh

Numerade Educator

01:00

Problem 25

Derive an expression for the velocity when a body dropped from a height reaches the ground.

Shital Rijal

Numerade Educator

06:17

Problem 26

Two kids standing on different floors of an apartment block drop balls from the balconies. The second kid standing at a lower level drops the ball 2 seconds after the first kid does. Both the balls reach the ground simultaneously, 5 seconds from the time the first ball was dropped. What is the difference between the heights of the two balconies? (Take $\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}$ )

Donald Albin

Numerade Educator

01:54

Problem 27

A ball is dropped from a certain height. If it takes $0.2 \mathrm{~s}$ to cross the last $6.2 \mathrm{~m}$ before hitting the ground, find the height from which it was dropped. (Take $\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}$ )

Satpal Satpal

Numerade Educator

04:22

Problem 28

A ball is thrown vertically upwards with a speed of $30 \mathrm{~m} \mathrm{~s}^{-1}$. Draw a graph showing the velocity of the ball as a function of time. (Take $\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^2$ )

Zulfiqar Ali

Numerade Educator

01:48

Problem 29

A man standing at a distance of $6 \mathrm{~m}$ from a building $21.6 \mathrm{~m}$ high observes a kid slipping from the top floor. With what speed should he run to catch the kid at a height of $2 \mathrm{~m}$ from the ground? (Assume speed of the person to be uniform; $\mathrm{g}=10 \mathrm{~ms}^2$ )

Satpal Satpal

Numerade Educator

01:46

Problem 30

A stone is dropped from a height of $45 \mathrm{~m}$. What will be the distance travelled by it during the last second of its motion? (Take $\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}$ )

Supratim Pal

Numerade Educator