2 A body of mass m' travelling with velocity av changes it's mass and velocity to twic and previous value. Find (I) Initial momentum of the body. (II) final momentum of the body. (III) Change in momentum of the body. (iv) Percentage change in momentum of the body.
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Answer:
Correct option is D)
According to Newton's second law of motion,
a=−F/m (−ve sign as the force is retarding)
According to third equation of motion,
v2=u2+2as
Given for v=0,u=u,
Displacement is s1
⟹s1=2au2=2Fu2m................(i)
Given for second scenario,
v=0,u=2u,
Displacement is s2
⟹s2=2a(2u)2=F2u2m................(ii)
From (i) and (ii),
s2=4s1
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