Which statement best defines Power?

• A. Force x Velocity
• B. Distance x Time
• C. Velocity x Acceleration
• D. Mass x Velocity

Answer: (A)

Power is the rate at which work is done. Work is energy transfer that results from a force moving an object along a displacement, and the instantaneous rate of that transfer depends on how fast the object is moving in the direction of the force. Mathematically, instantaneous power is the dot product of force and velocity: P = F · v. When the force acts along the direction of motion, this reduces to force times velocity.

This matches the statement that defines power as force x velocity. The other expressions don’t describe a rate of doing work: distance times time has no standard meaning as a rate of energy transfer; velocity times acceleration gives units that don’t correspond to power; mass times velocity describes momentum, not power.