A 5.0 kg block is lifted 3.0 m. What is the work done?

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Multiple Choice

A 5.0 kg block is lifted 3.0 m. What is the work done?

Work is the energy transferred by a force moving an object in the direction of that force. When lifting a block, the force you apply against gravity equals the weight of the block, and the distance moved is the height you lift it. Calculate: m g h = 5.0 kg × 9.8 m/s^2 × 3.0 m = 147 J. So the work done to lift the block is 147 joules. (Note: gravity itself does negative work during the lift, -147 J; the positive 147 J is the work you do against gravity.)

Work is the energy transferred by a force moving an object in the direction of that force. When lifting a block, the force you apply against gravity equals the weight of the block, and the distance moved is the height you lift it.

Calculate: m g h = 5.0 kg × 9.8 m/s^2 × 3.0 m = 147 J.

So the work done to lift the block is 147 joules. (Note: gravity itself does negative work during the lift, -147 J; the positive 147 J is the work you do against gravity.)

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