First slide

Projectile motion

Question

Jai is standing on the top of a building of height 25 m he wants to throw his gun to Veeru who stands on top of another building of height 20 m at distance 15 m from first building. For which horizontal speed of projection, it is possible?

Moderate

A

5 ms^-1
B

10 ms^-1
C

15 ms^-1
D

20 ms^-1

Solution

$\begin{aligned} t = \sqrt{\frac{2 H}{g}} = \sqrt{\frac{2 \times 5}{10}} = 1 {ms}^{- 1} \\ Speed = \frac{R}{t} = \frac{15}{1} = 15 {ms}^{- 1} \end{aligned}$

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