A ball of mass m = 20 g falls with a speed v1 = 5.0 m/s onto a steel plate and rebounds from it in the opposite direction with a speed v2 = 4.0 m/s. Determine the modulus of change in the momentum of the ball and the modulus of the average force acting on the ball during the impact, if the collision lasted τ = 1.0 • 10-2 s. Neglect air resistance.
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