Question

A stone stopped from the roof of a house,reaches the ground in 1.5 seconds. Calculate the distance of the roof from the ground and the velocity of the stone with which it strikes the ground.

Answer 1

it is given in question that

u = o (initial speed)

t= 1.5 , acceleration = g = 9.8 or we can take it 10

now using equation s = ut + 1/2 at^2 , s = 11.25 m

and equation v = u +at , we can calculate v that is equal to 14.7m/s