A porter lifts a suitcase weighing $20 k g$ from the platform and puts it on his head $2.0 m$ above the platform. Calculate the work done by the porter on the suitcase.

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Solution

The correct option is C

The porter is applying Force on the suitcase in the upward direction against gravity to put it on his head.

And since the suitcase is always moving slowly with no acceleration we can assume that net external force on it: so

$F = m g$

$F = 20 \times 10$

$F = 200 N$

Now suitcase is raised up by $2 m$ above ground

$W_{F} = F s c o s θ$

= $200.2. c o s 0^{\circ}$

= $400 N$

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