Question Detail
Question
A constant force F acts on an object moving with constant velocity v. The instantaneous power delivered by the force is given by which expression?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Instantaneous power is the dot product of force and velocity: P = F·v = F v cos θ, where θ is the angle between the force and velocity. For a force in the direction of motion (θ = 0°), this simplifies to P = F v.
Hint
Relate power to force and velocity, considering the rate of doing work as force times the rate of displacement.