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Question

A force of 20 N acts on a body of mass 4 kg for 5 s when it is initially at rest. Calculate the velocity acquired by the body and change in momentum of the body. [3 MARKS]


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Solution

Solution: 1 Mark per step

Step 1:
Given, force, F=20 N, mass, m=4 kg, initial velocity u=0 and time, t=5 s.
Let acceleration be a.
According to Newton's second law, F=ma.
So, a=Fm=204=5 m s2

Step 2:
Let the final velocity acquired by the body be v.
v=u+at
v=0+5×5=25 m s1

Step 3:
Momentum =mv=25×4=100 kg m s1


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