Question
A body is thrown vertically up with a speed of $10 \mathrm{~m} \mathrm{~s}^{-1}$ from the top of a wall of height $3.45 \mathrm{~m}$. The height from which another body should be dropped simultaneously such that the two bodies reach the ground at the same time is $\left(\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}\right)$(a) $40 \mathrm{~m}$(b) $24.5 \mathrm{~m}$(c) $6.9 \mathrm{~m}$(d) $20 \mathrm{~m}$
Step 1
The formula for time of flight is given by $t = \frac{u}{g} + \sqrt{\frac{2h}{g}}$, where $u$ is the initial velocity, $h$ is the height from which the body is thrown, and $g$ is the acceleration due to gravity. Show more…
Show all steps
Your feedback will help us improve your experience
Satpal Satpal and 66 other Physics 101 Mechanics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
A body is dropped from a tower of height $45 \mathrm{~m}$. Another body is thrown up at the same instant with speed $\mathrm{u}$ from a height of $30 \mathrm{~m}$. If they reach the ground simultaneously, $\mathrm{u}$ is $\left(\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}\right)$ (a) $5 \mathrm{~ms}^{-1}$ (b) $10 \mathrm{~m} \mathrm{~s}^{-1}$ (c) $15 \mathrm{~m} \mathrm{~s}^{-1}$ (d) $20 \mathrm{~m} \mathrm{~s}^{-1}$
A body is thrown vertically up from a wall of height $2.2 \mathrm{~m}$ with a speed of $10 \mathrm{~m} \mathrm{~s}^{-1}$. The distance travelled in the last second of its motion is $\left(\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}\right)$ (a) $5 \mathrm{~m}$ (b) $6 \mathrm{~m}$ (c) $7 \mathrm{~m}$ (d) $8 \mathrm{~m}$
Two bodies are thrown vertically upwards from walls of heights $2.2 \mathrm{~m}$ and $1.05 \mathrm{~m}$ respectively, with an initial velocity of $10 \mathrm{~m} \mathrm{~s}^{-1}$. The ratio of their times of flight is $\left(\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}\right)$ (a) $\frac{22}{21}$ (b) $\frac{12}{11}$ (c) $\frac{44}{23}$ (d) $\frac{13}{11}$
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD