The momentum of a body of mass 4 kg moving at 5 m per second is
- A. 20 kg m per second
- B. 0.8 kg m per second
- C. 50 kg m per second
- D. 9 kg m per second
Explanation
Momentum is mass multiplied by velocity, so 4 multiplied by 5 gives 20 kg m per second in the direction of motion. Its kinetic energy would be half times 4 times 25, that is 50 J, which is the trap in the third option. Momentum is a vector while kinetic energy is a scalar.