An object of mass 100 kg is accelerated uniformly from a velocity of 5 m s–1 to 8 m s–1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

NCERT Class IX
Sciences - Main Course Book

Chapter 9. Force and Laws of Motion

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2015-05-21T23:51:16+05:30

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M = 100 kg
u = 5 m/s
v = 8 m/s
t = 6 sec.

Initial momentum = m u = 100 * 5 = 500 kg-m/s
Final momentum = m v = 100 * 8 = 800 kg-m/s

Force = change in momentum / time duration
         = (800 - 500) / 6 =  50 Newtons.

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