Question

A firecracker at rest explodes into two fragments of masses m and 2m that fly apart along a line. If the lighter fragment has speed v, what is the speed of the heavier fragment?

Options

• v

• 2v

• \[\frac {v}{2}\]

• \[\frac {v}{3}\]

Answer 1

\[\frac {v}{2}\]

Explanation:

Let heavy speed be u. Then mv = 2m u ⇒ u = \[\frac {v}{2}\].