Q.

A particle is subjected to a force which varies with displacement as shown in figure. The total work done is

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a

20J

b

30J

c

40J

d

50J

answer is C.

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Detailed Solution

Work done=Area of F-S graphWork done=Area of first triangle+Area of rectangle+Area of second triangleW=12×base×height+length×breadth+12×base×heightW=12×4×5+4×5+12×(12-8)×5W=10+20+10W=40J
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