## Question

###### A ball of momentum p_1 collides with an identical stationary ball. The first ball deflects by...

A ball of momentum p_1 collides with an identical stationary ball. The first ball deflects by an angle theta_1 from its original direction with a momentum p'_1 while the second ball deflects by an angle theta_2 from the original direction of the first ball with a momentum p'_2 If the two balls have an elastic collision, then use the conservation of momentum vector diagram of Fig. 7.38 and conservation of kinetic energy to show that the two balls will always move off perpendicular to each other, i.e. theta_1 + theta_2 = 90 degree.

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