Question

an object of mass 20kg is accelerated uniformly from a velocity of 36km/hr to 54km/hr in 25 second. calculate the initial momentum and the final momentum of the object. also find the magnitude of force exerted on the object

Answer 1

Answer:

Initial momentum = 20 kg x 36 km/h x (1000/3600) m/s = 200 kg m/s

Final momentum = 20 kg x 54 km/h x (1000/3600) m/s = 300 kg m/s

Change in momentum = 300 - 200 = 100 kg m/s

Force exerted = change in momentum/time

Force = 100 kg m/s / 25 s

Force = 4 kg m/s^2

Force = 4 N

Answer 2

Answer:

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