Power is work done per unit time

Steps:

• Recall power formula: P = W / t, where W is work and t is time.
• Note alternative: P = F × v, since W = F × d and v = d / t.
• Evaluate each option against these formulas.
• Identify mismatch: Option D combines work and velocity without dividing by time.

Why D is correct:

• Power requires division by time (P = W / t); multiplying work by velocity adds extra distance/time factor, violating the definition.

Why the others are wrong:

• A: Force × time equals impulse (change in momentum), not power.
• B: Force × velocity directly gives power (P = F v) for constant force along motion.
• C: Work / time is the exact definition of power (P = W / t).

Final answer: D