Question

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8.) A body at rest has a mass of 3 kg. A force of
12 N acts on it for 4 s. Calculate its (a) velocity
attained, and (b) change in momentum.​

Answer 1

Explanation:

given,

u=0m/s

m=3 kg

f=12N

t=4 s

find

velocity

momentum

ans. firstly we apply the formula of force to find acceleration

so,F=ma

12=3Xa

a=12/3

a=4 m/s^2.

Now we apply 1 equation of motion

v=u+at

v=0+4X4

so,v=24m/s

now we find momentum

formula is p=mv

p= 3x24

p=72 kgm/s

so v=24 and p=74

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