An object of mass n1m0 is traveling with a speed of
n2v0 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 = n3m0v0 i,
What is n3? Note that the unit vector i points to the right.
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