Physics
posted by Caitlin .
I just need ideas on how i can estimate the height of a building by using only a tennis ball and a stop watch. I can only measure it by being on the ground level.

Can you throw the ball up as high as the roof? If so, time the ball from the top of the arc to when it hits ground
h=1/2 g t^2 
A tennis ball of mass m = 0.058 kg and speed v = 26 m/s strikes a wall at a 45^\circ angle and rebounds with the same speed at 45^\circ .
What is the magnitude of the impulse given to the ball?
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