(a) state the law of conservation of momentum. (b) A mass of 200 kg is accelerated uniformly from a velocity 10m s-¹ to 16 m s-¹ in 12 seconds. calculate the initial and final momentum of the object and the force that brings about this change.
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a) Law of conservation of momentum is that the total momenta of the system is equal to the total momenta of the system after getting a change in momentum.
b)
m = 200kg , u = 10m/s
p = mu
Initial momentum = 200×10 = 2000kg.m/s
m = 200kg , v = 16m/s
p = mv
Final momentum = 200×16 = 3200kg.m/s
v = u + at
16 = 10 + 12a
6 = 12a
a = 6/12 = 0.5m/s²
F = ma
= 200 × 0.5
= 100 N
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