Suzy drops a rock from the roof of her house. Mary sees the rock pass her 2.9 m tall window in 0.134 sec. From how high above the top of the window was the rock dropped? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m.

Explanation:

Given

length of window

time Frame for which rock can be seen is

Suppose h is height above which rock is dropped

Time taken to cover

so using equation of motion

where  y=displacement

u=initial velocity

a=acceleration

t=time

time taken to travel h  is

Subtract 1 and 2 we get

and from equation

so

and

so

substitute the value of in equation 2

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