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A tennis ball of a mass m = 0.2 kg is dropped from the height h1 = 2 m. It then accelerates under the influence of gravity and rebounds back from the ground to a new height of h2 = 1.5 m. The time of the impact between the ball and the ground is delta t = 2*10^-3 s.
Find:
(a) the impact speed of the ball (in m/s) before it hits the ground
(b) the takeoff speed of the ball (in m/s) after it bounces back of the ground
(c) the average force of the impact (in N)
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