Which of the following statements is incorrect? - Vidyadip

MCQ

Which of the following statements is incorrect?

✓
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

Correct option: A.

Kinetic energy may be zero, positive or negative.

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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