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Work, Energy, and Power — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsWork, Energy, and Power1 Mark
MCQ
Which of the following statements is incorrect?
  • A
    Kinetic energy may be zero, positive or negative.
  • B
    Power, energy and work are all scalars.
  • C
    Potential energy may be zero, positive or negative.
  • D
    Ballistic pendulum is a device for measuring the speed of bullets.
✓

Answer

  1. Kinetic energy may be zero, positive or negative.

Explanation:

The kinetic energy of a body of mass mm which is moving with velocity v is $\text{K}=\frac{1}{2}\text{min}^2$

Mass is always positive and if the velocity is either positive or negative, the kinetic energy is always positive due to the square of velocity.

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