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Use: F = m x a

1. Weigh the ball

2. Measure the distance between the ball and him, throw the ball and record the time it took for it to hit him: (E.x: He is standing at 10 m away from me, it took the ball 1 second to reach him, it accelerated at 10 m/s

^{2}

3. Then, multiply the mass by the acceleration for the Force at which the ball hits him?

Would that work? Thanks!