Question

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

Answer 1

Initial velocity of the object, u = 5 m/s 

Final velocity of the object, v = 8 m/s 

Mass of the object, m = 100 kg 

Time take by the object to accelerate, t = 6 s 

Initial momentum = mu = 100 × 5 = 500 kg ms^-1 

Final momentum = mv= 100 × 8 = 800 kg ms ^-1

Force exerted on the object, F = mv - mu / t

Initial momentum of the object is 500 kg ms^-1 . 

Final momentum of the object is 800 kg ms ^-1 . 

Force exerted on the object is 50 N.