A car’s engine stalls going up a hill and slows down as a result. Which statement best describes the energies of the car?

Question

BlackTom AI · Accepted Answer

Consider what happens when a car stalls while climbing a hill and slows down.
Option 1: The kinetic energy increases and the gravitational potential energy decreases. This would imply the car is speeding up while descending, which contradicts the given scenario of stalling and moving uphill, so this is incorrect.
Option 2: The kinetic energy decreases and the gravitational potential energy increases. As the car slows down while moving upward, its speed (and thus kinetic energy) drops, while its height increases, leading to a rise in gravitational potential energy. This matches the described situation.
Option 3: The kinetic energy decreases and the gravitational potential energy remains the same. While the kinetic energy decreasing is plausible during stalling, the car is going uphill, so its height changes and gravitational potential energy should increase rather than stay constant; this makes the option inaccurate.
Option 4: The kinetic energy increases and the gravitational potential energy remains the same. Increasing kinetic energy while moving uphill would imply speeding up, which contradicts the stall and slow-down described, and the height would still be changing, so this is incorrect.

A car’s engine stalls going up a hill and slows down as a result. Which statement best describes the energies of the car?单项选择题

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