A Stream of Gas Consists of N Molecules $\degree$ C)mnv Sin 30

Multiple Choice

A stream of gas consists of n molecules.Each molecule has mass m and speed v.The stream is reflected elastically from a rigid surface as shown.The magnitude of the change in the total momentum of the stream is:

A) 2mnv
B) 2mnv sin 30 $\degree$
C) mnv sin 30 $\degree$
D) mnv cos 30 $\degree$
E) mnv