Power equals work done divided by time

Steps:

• Identify work done against gravity as force (weight) times vertical distance (height).
• Calculate work: weight × height.
• Divide work by time taken to get power.
• Formula: power = (weight × height) / time.

Why B is correct:

• Matches the physics definition of power as P = W/t, where work W = mgh (weight provides mg, height is h).

Why the others are wrong:

• A: Gives work, not power (missing time division).
• C: Yields a time-to-mass ratio with no physical meaning for power.
• D: Equals velocity times weight, which is unrelated to power.

Final answer: B