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A particle which is experiencing a force...

A particle which is experiencing a force, given by `vec(F) = 3 vec(i) - 12 vec(j)`, undergoes a displacement of `vec(d) = 4 vec(i)`. If the particle had a kinetic energy of 3 J at the beginning of the displacement

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The correct Answer is:
15
Work done by a force = Change in kinetic energy `(Delta K.E.)`
`rArr Delta K.E.=vecF*vecd=(3hati-12hatj)*(4hati)=12J`
`rArr K_(f)=(K_(i)+12)J=15J`
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