a stone drops from the edge of a roof. it passes a window 2 mtr high in 0.01 sec . how far is the roof above the top of the window?

Answer 1

The distance traveled in .01 second at time t is

4.9(t+0.01)^2 - 4.9t^2 = 4.9(.02t+.0001)

So, if it fell 2m in that time,

4.9(.02t+.0001) = 2.0
t = 20.4

So, it had been falling for 20.4 seconds when it reached the window. Now just figure how far it fell in that time.

Answer 2

Height =2m
Time -2s
Acceleration due to gravity-9.8
From second equation of motion