Question

The mass of an object P is double the mass of object Q. If both move with the same velocity, then ratio of K.E. of P to Q is:

• A. 1:2
• B. 2:1
• C. 1:4
• D. 4:1

Answer 1

Answer: (B)

2:1

Let the mass of P be $2m$ and of Q be $m$

$K{E}_P=\frac{2m{v}^2}{2}$

$K{E}_Q=\frac{m{v}^2}{2}$

So $\frac{K{E}_P}{K{E}_Q}=\frac{2}{1}$