First slide

Kinetic energy

Question

A light and a heavy body have equal momenta. Which one has greater kinetic energy?

Easy

A

The light body
B

The heavy body
C

Both have equal KE
D

Nothing can be said

Solution

For light body $K_{m} = \frac{p^{2}}{2 m} a n d f o r h e a v y b o d y K_{M} = \frac{p^{2}}{2 M} . S i n c e M > m w e c a n c o n c l u d e K_{m} > K_{M}$

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