Question

2.1.2 quiz: types of energy
question 5 of 10
which person has kinetic energy but does not have potential energy?
a. a ball being dropped
b. a person climbing a ladder
c. a person walking on a flat sidewalk
d. a person riding an elevator downward

Explanation:

• Kinetic energy is energy of motion, potential energy (gravitational) depends on height.
• Option A: A ball being dropped has both KE (falling) and PE (above ground).
• Option B: Climbing a ladder involves motion (KE) and height (PE).
• Option C: Walking on a flat sidewalk: moving (KE), height relative to ground is constant (no gravitational PE as height change is negligible/zero for flat surface).
• Option D: Riding elevator downward: moving (KE) and has height (PE) as it's above ground level.

Answer:

C. A person walking on a flat sidewalk