Question

An object of mass 50 kg is accelerated uniformly from a velocity of 4 m/s to 8 m/s in

8s. Calculate the initial and final momentum of the object. Also find the magnitude of

the force exerted on the object.​

Answer 1

Explanation:

Acceleration=final velocity- initial velocity /time

8-4/8= 0.5 m/s^2

Fore = ma

50×0.5 =25 N

Initial momentum=50×4=200 Newton second

Final momentum=50×8 = 400 Newton second

Answer 2

Answer:

initial momentum = 200 kg m/s

final momentum = 400 kg m/s

Force = 25 N

Explanation:

Initial velocity of the object, u = 4 m/s

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

Mass of the object, m = 50 kg

Time take by the object to accelerate, t = 8 s

Initial momentum = mu = 50 × 4 = 200 kg m/s

Final momentum = mv = 50 × 8 = 400 kg m/s

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

= m (v-u) / t

= 400 – 200

= 200 / 8

= 25 N

Initial momentum of the object is 200 kg m/s

Final momentum of the object is 400 kg m/s

Force exerted on the object is 25 N.