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When you weigh yourself on solid ground, your weight is 155 lb. In an elevator, your apparent weight is 135 lb.

What could be the weight reading in the elevator when it's accelerating downwards?

A) 125 lb
B) 130 lb
C) 140 lb
D) 145 lb

Answer :

Final answer:

The correct option is C) 140 lb. If you weigh 155 lb on solid ground and 135 lb in an elevator, it implies that the elevator is accelerating downwards, making your apparent weight less than your actual weight. In the case of free fall, the scale would read an apparent weight of 0 lb because you would be weightless.

Explanation:

Apparent weight is the reading on a scale which accounts not just for the true weight due to gravity, but also for the additional effects of acceleration. In the case of an elevator, when it accelerates upwards, your apparent weight increases, and when it accelerates downwards, your apparent weight decreases. When in free fall, such as when the cable of an elevator snaps, you're in a state of weightlessness because there is no contact force pushing up against you, resulting in a scale reading of zero. This is why astronauts experience weightlessness in orbit; they, like the scale in the broken elevator, are in continuous free fall towards the Earth.

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