Question

A ball is thrown from the edge of roof it takes 0.1 second to cross a window Fight 2 metre find height of the roof above the top of the window.

Answer 1

Answer:

0.049m

Explanation:

Let us consider the height of the roof from ground be 'h' and since the window is 2 m above the ground so the distance between roof and window is 'h-2'.

The ball takes 0.1 sec to cross the height of 'h-2'.

Hence, t=sqr rt(2H/g)

            0.1^2=2(h-2)/9.8

            0.01/2=(h-2)/9.8

            h-2=0.049m which is the height of the roof above the window.