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Question

Which one of the following is a scalar quantity?



A
Displacement
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B
Velocity
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C
Acceleration
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D
Linear momentum
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E
Kinetic energy
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Solution

The correct option is E Kinetic energy
All quantities except kinetic energy have both direction and magnitude. So they are vectors but kinetic energy is a scalar because it is equal to 12mv2 where v2 is a result of dot product of v.v and its a scalar.

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