A force acts for 8 seconds on a body of mass 100 kg at rest after which the force ceases and the body describes a 80 meter in next 4 seconds.Find the magnitude of force.
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delta V = 20 m/s in 8 seconds so the acceleration is 20 / 8 = 2.5 m/s/s
F = m . a = 100 . 2.5 = 250 N
F = m . a = 100 . 2.5 = 250 N