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Question

The expression for kinetic energy is


A

13mv2

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B

12mv2

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C

12mv2

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D

12mv

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Solution

The correct option is B

12mv2


Kinetic energy:

  1. The energy possessed by an object due to its motion is known as kinetic energy.
  2. Kinetic energy is directly proportional to the mass(m) of the object and to the square of its velocity(v). That is, K.E=12mv2
  3. Kinetic energy does not require direction to define it, so it is a scalar quantity
  4. Kinetic energy is measured in units of Joules (J), where1J=1kgm-2s-2.
  5. Kinetic energy is dimensionally represented as [M1L2T-2].

Therefore, the expression for kinetic energy is K.E=12mv2.

Hence, option B is correct.


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