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| Q. |
In which of the following cases, kinetic energy is being used in performing work? |
| A. | Paddling the bicycle to cover a distance |
| B. | Driving a car to cover a distance |
| C. | Wind mill grinding wheat grain |
| D. | Rowing a boat in the lake |
| Answer» B. Driving a car to cover a distance | |
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Explanation: The work done on any object goes into changing the kinetic energy of that object. Since the work done by the car engine is equal to the change in kinetic energy of the car we can say that kinetic energy is being used in performing work. The kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. |
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