A particle moves from a point (-2i+5j ) to (4j+3k ) when a force of (4i+3j )N is applied. How much work has been done by the force? [NEET 2016]

Question

Accepted Answer

Correct answer: C. (c) Position vectors of the particles are r_1=-2i+5j andr_2=4j+3k ∴ Displacement of the particle, s=r_2-r_1=4j+3k- (-2i+5j )=2i-j+3k Force on the particle, F=4i+3jN ∴ Work done, W=F s = (4i+3j ) (2i-j+3k )=8-3=5 J

$A particle moves from a point (- 2 i + 5 j) to (4 j + 3 k) when a force of (4 i + 3 j) N is applied. How much work has been done by the force? [NEET 2016]$

Solution

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