Question

an object of mass 100 kg is accelerated uniformly from 5 M per second 28 M per second in 6 seconds calculate final momentum find the force
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Answer 1

Momentum = mass × velocity.

So, initial momentum = mass × initial velocity.

• Mass = 100 kg

• initial velocity = 5m/s

So momentum (initial) = 100 × 5

 ⇒ 500 kg m/s

• Final momentum = mass × final velocity.

• Mass = 100 kg

• Final velocity = 8 m/s

So, final momentum = 100 × 8

⇒ 800 kg m/s

 To find the force :-

From Newton's second law,

F = ∆p

Where, ∆p = change in momentum.

∆p = (mv - mu)/t

⇒  ∆p = (final momentum - initial momentum)/time

So F = (800 - 500)/6

⇒  F = 300/6

⇒ F = 50 N