A girl runs up a flight of stairs at a constant speed v, and the gain in her potential gravitational energy is U. When she runs up the same stairs at half that speed, her mechanical energy is
A) zero.
B) smaller.
C) the same.
D) larger.

Question

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The Answer of A girl runs up a flight of stairs at a constant speed v, and the gain in her potential gravitational energy is U. When she runs up the same stairs at half that speed, her mechanical energy is
A) zero.
B) smaller.
C) the same.
D) larger.

A Girl Runs Up a Flight of Stairs at a Constant