# Physics

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a 0.2kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30 m/s and rebounds up at 25 m/s. If the ball is in contact with the sidewalk for 0.025s, what is the magnitude of the average force applied by the sidewalk on the ball?
I need steps on how to do this including equations ASAP!

• Physics -

a=V-Vo)/t = (-25-30)/0.025=2200m/s^2.

F = m*a = 0.2 * 2200 = 440 N.

Note: The velocity when leaving sidewalk is in opposite direction(neg.).

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