estimate the average force exerted by a shot-putter on a 7.0kg shot if the shot is moved through a distance if 2.8m and is released with a speed of 13 m/s
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v² = u² + 2as
(13m/s)² = 0 + 2 * a * 3m → a = 28.2 m/s²
F = ma = 7kg * 28.2m/s² = 197 N
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