Physics

The false statement is: If an object is lifted at a constant speed, the work done by gravity is zero.

When an object is lifted at constant speed, gravity acts downward while the applied force acts upward. While the net force is zero (because the object moves at constant speed), gravity is still doing negative work (since the displacement is upward while gravity acts downward).

Option A: Gravity always does positive work when an object moves downward.

Correct: When an object moves downward, gravity acts in the same direction as the motion, so the work done by gravity is positive.

Option B: When an object ...