Original Project
Energy: Forms, Transformation, Transfer, and Conservation
Gravitational potential energy is associated with the distance an object is above a reference point, such as the…
Item EG090001: Two identical balls that are thrown up in the air will have the same amount of gravitational potential energy when they are at the same height above the ground.
A student threw two identical balls up into the air. For the balls to have the same amount of gravitational potential energy at a certain point in time, what must be true?
- They must be moving at the same speed.
- They must be at the same height above the ground.
- They must have been thrown at the same time.
- They must have been thrown with the same amount of force.
Answer Choice |
Overall |
Grades |
Gender |
Primary Language |
||||
|---|---|---|---|---|---|---|---|---|
| n = 3061 |
6–8 n = 1817 |
9–12 n = 1233 |
Male n = 1479 |
Female n = 1513 |
English n = 2682 |
Other n = 296 |
||
| A. | They must be moving at the same speed. | 18% | 19% | 16% | 18% | 18% | 17% | 25% |
| B. | They must be at the same height above the ground. | 38% | 35% | 42% | 41% | 36% | 39% | 29% |
| C. | They must have been thrown at the same time. | 17% | 18% | 15% | 16% | 18% | 16% | 23% |
| D. | They must have been thrown with the same amount of force. | 27% | 28% | 27% | 26% | 29% | 28% | 23% |