Question

Which of the following has the greatest kinetic energy? A. a mass of 4m at velocity v. B. a mass of 3m at velocity 2v. C. a mass of 2m at velocity 3v. D. a mass of m with a velocity of 4v.

Answer 1

Option C

Step-by-step explanation:

Kinetic energy is the energy that the body possesses by virtue of its motion.

The formula for Kinetic energy is given by
`(1)/(2) mv^2`

Using this formula let us find kinetic energy for the bodies given and find out which is the greatest

A) KE =
`(1)/(2) (4m)(v^2) = 2mv^2`

B) KE =
`(1)/(2) (3m)(2v)^2 = 6mv^2`

C) KE =
`(1)/(2) (2m)(3v)^2 = 9mv^2`

D) KE =
`(1)/(2) (3)(4v)^2 = 8mv^2`

Comparing these we find that 9mv^2 is the highest.

Hence option C is the answer.