First slide

Kinetic energy

Question

A light and a heavy body have equal KE. Which one has a greater momentum?

Easy

A

The light body
B

The heavy body
C

Both have equal momenta
D

It is not possible to say anything without additional information

Solution

For heavy body $p_{M} = \sqrt{2 M K} a n d f o r l i g h t b o d y p_{m} = \sqrt{2 K m} S i n c e M > m, w e c o n c l u d e, p_{M} > p_{m}$

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