1.

If the resultant force acting on a body of constant mass is zero, the body's momentum is:1. increasing2. decreasing3. always zero4. constant5.

Answer» Correct Answer - Option 4 : constant

The correct answer is Constant.

  • If the resultant force acting on a body of constant mass is zero, acceleration is zero and velocity is constant such that the body's momentum is constant.
  • F=ma
    • where F is the resultant force on a moving object.
    • If F is 0 then acceleration will also be 0 (mass cannot be 0).
  • p=mv
    • where p is momentum.
    • since the acceleration is 0, the velocity must be constant.
  • Therefore the momentum of the body will also be constant.


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