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Questions  

The force acting on an object varies with the distance travelled by the object as shown in Figure . Work done by the force in moving the object from x = 2 m to x=4 m is:

a
4 J
b
6 J
c
8 J
d
2J

detailed solution

Correct option is A

work done = shaded area =2×43+12(4/3)(2)= 8/3 + 4/3= 12 /3 = 4J

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A body of mass 3 kg is under a force which causes a displacement in it, given by s =t2 / 3 (in m). Find the work done by the force in 2 second


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