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3.) A worker lifts 80 concrete blocks a distance of 1.5 m from the ground into...

3.) A worker lifts 80 concrete blocks a distance of 1.5 m from the ground into the back of a truck. Each block has a mass of 5.0 kg. How much work is done to lift all of the blocks into the truck?

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Answer #1

Work done is equal to change in potential energy plus change in kinetic energy of the block. But change in kinetic energy is zero because the blocks are being lifted with zero speed. Hence work done will be equal to change in potential energy of the blocks when they are lifted by the given height.

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