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Standard XII

Physics

COM in Collision and Explosion

A body of mas...

Question

A body of mass 5 kg is free to move along the x-axis .It is a rest and from t=0 onwards it is subjectived to a time-dependens force F(t) in the x direction.If change in linear momentum it body is 6.75 N-S after 5 sec.Then the kinetic energy of the block after 4.5 seconds

0.75 J

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1.11 j

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4.6 J

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8.039J

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Solution

The correct option is C 4.6 J
Linear momentum is conserved.
So, final momentum =6.75N-s.
Kinetic energy $= p^{2} / 2 m = \frac{(6.75)^{2}}{(2 \times 5)} = 4.6$ J.

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A body of mass 5 kg is free to move along the x-axis .It is a rest and from t=0 onwards it is subjectived to a time-dependens force F(t) in the x direction.If change in linear momentum it body is 6.75 N-S after 5 sec.Then the kinetic energy of the block after 4.5 seconds

The correct option is C 4.6 JLinear momentum is conserved. So, final momentum =6.75N-s.Kinetic energy =p2/2m=(6.75)2(2×5)=4.6J.

The correct option is C 4.6 J
Linear momentum is conserved.
So, final momentum =6.75N-s.
Kinetic energy $= p^{2} / 2 m = \frac{(6.75)^{2}}{(2 \times 5)} = 4.6$ J.