Question

MCQ : A body of mass 2 kg is moving with a velocity of 8 m/s on a smooth surface. If it is to be brought to rest in 4 s, then the force to be applied is

  • Force and Motion
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Answer

Question

A body of mass 2 kg is moving with a velocity of 8 m/s on a smooth surface. If it is to be brought to rest in 4 s, then the force to be applied is

  1. 8 N
  2. 4 N
  3. 2 N
  4. 1 N

Answer

4 N

Explanation

F = Δp/t

F = m(v-u)\over t

F = 2 \times (0-8)\over 2

F = 1 \times (-8)\over 2

F = – 4 N

The negative sign indicates that the force is in the opposite direction to the motion of the ball.

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