First slide

Vertical projection from top of a tower

Question

A ball is thrown vertically upward with a velocity u from the top of a tower , it strikes the ground with velocity 3u. The time taken by the ball to reach the ground is

Moderate

A

u/g
B

2u/g
C

3u/g
D

4u/g

Solution

$\begin{array}{l} v = u + at \\ \Rightarrow 3 u = - u + gt \\ \Rightarrow t = \frac{4 u}{g} \end{array}$

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