Question

a stone dropped from a tree takes 2 seconds to reach the ground . find its velocity on striking the ground ?

Answer 1

taking a situation as free fall
u=0
a=10m/s^2
t=2 sec
v=u+at
v=0+10×2
v=20m/s

Answer 2

The velocity of the stone on striking the ground is 19.6 m/s.

Explanation:

It is given that, a stone dropped from a tree takes 2 seconds to reach the ground. We need to find its velocity on striking the ground. Initially, the stone is at rest such that its initial velocity is 0. It will move downward under the action of gravity. Let v is the velocity on striking the ground. using first equation of motion.

$v=u+at$

Here, a = g and u = 0

$v=gt\\\\v=9.8\times 2\\\\v=19.6\ m/s$

So, the velocity of the stone on striking the ground is 19.6 m/s.

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A stone dropped from a tree takes 2 seconds to reach the ground. Find its velocity on striking the ground ?

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