A man is moving on his bike with 54 kmh^-1. He takes a u-turn in 10 s and continues to move wit

Name: Problem 85, Chapter 1: A Complete Resource Book in Physics for JEE Main
Uploaded: 2021-10-10T00:11:48-08:00
Duration: 1 min 48 s
Channel: Akshaya Rs
Description: A man is moving on his bike with 54 kmh^-1. He takes a u-turn in 10 s and continues to move with the some velocity. Find average acceleration during this time. (A) 3.0 ms^-2 (B) 1.5 ms^-2 (C) 0 (D) -1.5 ms^-2

step 1 What's some basic concept of the vectors. The question is a man is moving on a spike with 54 km

Question

A man is moving on his bike with $54 \mathrm{kmh}^{-1}$. He takes a u-turn in $10 \mathrm{~s}$ and continues to move with the some velocity. Find average acceleration during this time. (A) $3.0 \mathrm{~ms}^{-2}$ (B) $1.5 \mathrm{~ms}^{-2}$ (C) 0 (D) $-1.5 \mathrm{~ms}^{-2}$

   A man is moving on his bike with $54 \mathrm{kmh}^{-1}$. He takes a u-turn in $10 \mathrm{~s}$ and continues to move with the some velocity. Find average acceleration during this time.
(A) $3.0 \mathrm{~ms}^{-2}$
(B) $1.5 \mathrm{~ms}^{-2}$
(C) 0
(D) $-1.5 \mathrm{~ms}^{-2}$

A Complete Resource Book in Physics for JEE Main

Sanjeev Kumar 1st Edition

Chapter 1, Problem 85

Instant Answer

Solved by Expert Akshaya Rs

10/10/2021

Step 1

We can convert this into meters per second by multiplying by $\frac{5}{18}$. So, $v_1 = 54 \times \frac{5}{18} = 15 \mathrm{ms}^{-1}$. We can write this in vector form as $v_1 = +15 \hat{i}$. Show more…

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A man is moving on his bike with $54 \mathrm{kmh}^{-1}$. He takes a u-turn in $10 \mathrm{~s}$ and continues to move with the some velocity. Find average acceleration during this time. (A) $3.0 \mathrm{~ms}^{-2}$ (B) $1.5 \mathrm{~ms}^{-2}$ (C) 0 (D) $-1.5 \mathrm{~ms}^{-2}$

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Key Concepts

Average Acceleration

Average acceleration is the change in velocity divided by the time over which the change takes place. It considers both the magnitude and the direction of the velocity change, making it a vector quantity.

Velocity as a Vector

Velocity is a vector quantity, meaning it has both magnitude and direction. Hence, a reversal in direction, even with the same speed, results in a significant change in velocity.

Unit Conversion

Unit conversion involves converting quantities from one system of units to another to maintain consistency in calculations. This is essential when speeds or other measurements are provided in different units, such as converting kilometers per hour to meters per second.

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