Question

An object of mass 100 kg is accelerated uniformly from a velocity of 5 metre per second to 8 metre per second in 6 second. Calculate the initial and final momentum of the object. Also find the magnitude of force exerted on the object.

Answer 1

Answer:

Momentum = Mass × Velocity

Initial speed, u = 5 m/s

Final speed, v = 8 m/s

Mass , m = 100kg

Initial momentum = mu = 100 × 5

= 500 kg m/s

Final momentum = mv = 100 × 8

= 800 kg m/s

Force = Rate of change of momentum

= 800 - 500 /6

= 300/6

=50 N

Answer 2

Answer: F= 50N , initial momentum = 500 , final momentum = 800

Explanation:

V = u + at

8 = 5 + 6a

a = 1/2 m/s^2

Thus, F= ma

F = 100 × 1/2

F= 50 N

And initial momentum = mu = 100×5

= 500

Final momentum = mv = 100×8

= 800