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Question

The work done by a force F=(6x3^i) N is displacing a particle from x=4 m to x=2 m is

A
240 J
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B
360 J
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C
120 J
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D
420 J
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Solution

The correct option is B 360 J
F=6x3^i
x=4 to x=2
dw=f.dx
As displacement is along ^i so F=6x3
246x3dx=[6x44]24
[6x44+6x44]24
6×(4)44+60(2)44
=360J

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