Question

An object of mass 100 Kg is accelerated uniformly from a velocity of 5ms^-1 to 8ms^-1 in 6s. Calculate the initial and final momentum of the object. Also find the magnitude of the force exerted on the object.

Answer 1

Mass of the object, m = 100 Kg
Initial velocity, u = 5 ms^-1
Final velocity, v = 8 ms^-2
(i) Initial momentum = mv = 100 × 5 = 500 Kgms^-1
Final momentum = mv = 100 × 8 = 800 Kgms^-1

(ii) From Newton’s second law
Force exerted on the object = Rate of change of momentum