Question

An object is moving with velocity V. The velocity of a moving object is gets doubled. Identify which of the following statements about the moving object is correct?

• A. The kinetic energy of the object increases by four
• B. The displacement of the object increases by four
• C. The momentum of the object increases by four
• D. The frictional force increases by four
• E. None of these quantities increase by four

Answer 1

The correct option is A The kinetic energy of the object increases by four

Kinetic energy, $K=\frac{1}{2}m{v}^2$

If velocity v is doubled so kinetic energy will increase 4 times.

Since displacement and momentum is proportional to velocity so they will increase 2 times but frictional force does not related to velocity.