Question

A force of 10N act on a body of mass 2kg for 3s initially at rest. Calculate
(i)Velocity acquired by body.
(ii)Change in moment of body.

Answer 1

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Answer 2

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Your answer
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Force = F = 10 N

Mass = m = 2 kg

Time = t = 3 s

Initial velocity = 0 m/s

(I) Velocity acquired by the body (v)

F = ma

=> F = m × (v - u )/t

=> 10 = 2 × (v - 0)/3

=> 10 = 2 × v/3

=> v = (10 × 3)/2

=> v = 15 m/s

(ii) Change in momentum

Change in momentum = P2 - P1

= mv - mu

= m(v - u)

= 2( 15 - 0) kg m/s

= (2 × 15 ) kg m/s

= 30 kg m/s

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