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Question

Force versus displacement curve is shown in the diagram. Find the change in kinetic energy by the force at the end of 30 m.



A
25 J
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B
50 J
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C
75 J
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D
100 J
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Solution

The correct option is B 50 J
According to work energy theorem we know that,
Change in kinetic energy = Net work done.

We also know that net work done is
= Area under FS curve
=Area of tringle OAB Area of tringle BDC

=12×20×10(12×10×10)
=50 J

Hence the change in kinetic energy
=50 J

Option B is the correct answer

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