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Answer the following questions based on work & energy.

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Multiple choice

1.

The SI unit of power is
 Joule Watt Volt

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2.

A pebble is dropped from the top of a cliff 60 m in height. The kinetic energy of the pebble equals twice its potential energy at a distance of _______ above sea level.
 45 m 15 m 30 m 20 m

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3.

The energy possessed by a body due to its position or configuration is called _______ energy.
 potential thermal sound kinetic

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4.

A body loses 490 J of potential energy in falling through 10 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of
 50 kg 98 kg 49 kg 5 kg

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5.

By definition, work is done when a _______ moves through a distance.
 force pressure mass

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6.

A body loses 1764 J of potential energy in falling through 45 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of
 39 kg 180 kg 4 kg 441 kg

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7.

If an engine does 528 J of work in 6 seconds, its average power is
 522 W 534 W 3168 W 88 W

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