An object of mass 100 kg is accelerated uniformly from a velocity of 5ms−1 to 8ms−1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object
50 N
25 N
100 N
75 N
A
50 N
B
25 N
C
100 N
D
75 N
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Solution
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Mass of object, m=100kg; initial velocity, u=5ms−1; final velocity, v=8ms−1; time, t=6s Initial momentum =mu=100×5=500Ns Final momentum =mv=100×8=800Ns
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