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Question

Gravitational field in a region is given by (3ˆi+2ˆj)Nkg1. Find the work done by the gravitational field when a particle of mass m moves from one point (x1,y1) to another (x2,y2) one the line 2y+3x=5

A
zero
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B
9(x2x1)+4(y2y1)
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C
9(x1x1)+4(y1y2)
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D
none
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Solution

The correct option is A zero
Direction of displacement and gravitational field (so as gravitational force) are at right angle to each other, as the product of their slope is equal to 1
Therefore work done is zero.

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