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A paticle acted on by constant forces `4hati=hatj-3hatk and 3hati+hatj-hatk` is displaced from the point `hati+2hatj+3hatk to 5hati+4hatj+hatk`. Find

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A paticle acted on by constant forces `4hati=hatj-3hatk and 3hati+hatj-hatk` is displaced from the point `hati+2hatj+3hatk to 5hati+4hatj+hatk`. Find the work done
A. 50 units
B. 20 units
C. 30 units
D. 40 units
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Correct Answer - D
we have,
` vecF`= Total force, =` 7hati +2hatj -4hatk`
` vecd= " Displacement vector " = 4hati +2hatj -2hatk`
Work done = `vecF.vecd = ( 28 + 4+8) ` unit= 40 units
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