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  4. A woman pushes a trunk on a railway platform that has a rough surface. She applies a force F over a distance of 20 m as shown by the graph. Calculate the work done by the woman.

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Q. A woman pushes a trunk on a railway platform that has a rough surface. She applies a force $F$ over a distance of $20 m$ as shown by the graph. Calculate the work done by the woman.Physics Question Image

Work, Energy and Power

Solution:

$W=\int F d x=$ Area under the graph
$W=$ Area of rectangle $+$ Area of trapezium
$=(100 \,N )(10\, m )+\frac{1}{2}(100\, N +50 \,N )(10 \,m )$
$=1000\, J +750 \,J =1750\, J$