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Question

An object of mass 100 kg is accelerated uniformly from a velocity of 5ms1 to 8ms1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object
  1. 50 N
  2. 25 N
  3. 100 N
  4. 75 N

A
50 N
B
25 N
C
100 N
D
75 N
Solution
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Mass of object, m=100kg; initial velocity, u=5ms1; final velocity, v=8ms1; time, t=6s
Initial momentum =mu=100×5=500Ns
Final momentum =mv=100×8=800Ns

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