Question

An object falling freely from rest reaches ground in 2s. If acceleration due to gravity is 9.8 m s-2 the velocity of the object on reaching the ground will be:

Answer 1

Answer:

19.6

Explanation:

s=ut+1/2at²    here u=0     then s=1/2gt²

s=1/2×9.8×2²=19.6

we know that    

v²=u²+2as    u=0

v=√2×9.8×19.6=19.6