A worker lifts a $20.0 k g$ bucket of concrete from the ground up to the top of a $20.0 m$ tall building. What is the amount of work that the worker did in lifting the bucket?

3.92 k J

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400 J

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560 k J

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4.08 J

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Solution

The correct option is D $4.08 J$
Given:
The mass of the bucket $m = 20 k g$
The height of the building $h = 20 m$
$Work done by the worker = Potential energy of bucket at the top of the building$

$∴ W = m g h$

$\Rightarrow W = 20 \times 9.8 \times 20$

$\Rightarrow W = 3920 J$

Thus, the required work done is $3.92 k J$

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A worker lifts a 20.0kg bucket of concrete from the ground up to the top of a 20.0m tall building. What is the amount of work that the worker did in lifting the bucket?

The correct option is D 4.08JGiven:The mass of the bucket m=20 kgThe height of the building h=20 mWork done by the worker=Potential energy of bucket at the top of the building ∴W=mgh ⇒W=20×9.8×20 ⇒W=3920J Thus, the required work done is 3.92kJ

A worker lifts a $20.0 k g$ bucket of concrete from the ground up to the top of a $20.0 m$ tall building. What is the amount of work that the worker did in lifting the bucket?