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A woman pushes a trunk on a railway platform which has rough surface. She applies force of 80 N over a distance of 10 m. There after she gets tired and progressively reduces force to 50 N for a further distance of 5m. The total work done by the two forces is

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1750 J

1125 J

1450 J

725 J

answer is B.

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Detailed Solution

$W = F_{1} s_{1} + (\frac{F_{1} + F_{2}}{2}) s_{2}$

$\Rightarrow W = 80 \times 10 + (\frac{80 + 50}{2}) 5 J = 1125 J$

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