__Question 1__

Car X is travelling at half the
speed of car Y. Car X has twice the mass of car Y.

Which statement is correct?

A Car X has half the kinetic energy of car Y.

B Car X has one quarter of the kinetic energy of car Y.

C Car X has twice the kinetic energy of car Y.

D The two cars have the same kinetic energy.

**Reference:**

*Past Exam Paper – June 2004 Paper 1 Q17*

__Solution 1:__**Answer: A.**

Let the speed of car X = v. Speed of car Y = 2v

Let the mass of car X = 2m. Mass of car Y = m

Kinetic energy = ½ mv

^{2}
KE of car X = ½ (2m) v

^{2}= mv^{2}
KE of car Y = ½ (m) (2v)

^{2}= 2 mv^{2}
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