If P is the momentum of an object of mass m, then the expression Pm has the same unit as:
Correct answer: B. Energy
- A. Acceleration
- B. Energy
- C. Force
- D. Impulse
Explanation
The unit of momentum is kg.m/s and the unit of mass is kg, so the unit of Pm would be kg2.m/s. This unit is equivalent to the unit of energy, which is the joule J. Therefore, option b is correct.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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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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