Problem C2:
An object of mass n_{1}m_{0} is traveling with a speed of
n_{2}v_{0} towards a wall. The direction of its velocity
makes an angle &theta with the wall, where tan &theta = 4/3. The object
bounces elastically off the wall with the same speed and angle as shown
in the figure above. If the change in momentum of the object is
**&Delta P** = n_{3}m_{0}v_{0} **i**,
What is n_{3}? Note that the unit vector **i** points to the right.

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