Medium
Two objects of masses 2 kg and 4 kg are moving with the same momentum. Which one has greater kinetic energy?
Explanation
Explanation
For a given momentum p, kinetic energy KE = p²/(2m). Since KE is inversely proportional to mass for the same momentum, the lighter object (2 kg) has greater kinetic energy than the heavier one (4 kg).
PRO TIP
Re-check your working by substituting the answer back into the original question.