The momentum of a body of mass 4 kg moving at 5 m per second is
Correct answer: A. 20 kg m per second
- 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.
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About Linear Momentum
Linear momentum is the vector product of mass and velocity, p = mv, and changes when a net external force acts. Work includes impulse as the change in momentum, conservation of momentum in isolated systems, collisions and explosions, and the distinction between elastic, inelastic and perfectly inelastic collisions.
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