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Protons of mass m and speed 1.50 x 107 m/s collide elastically with nuclei of mass...

Protons of mass m and speed 1.50 x 107 m/s collide elastically with nuclei of mass M at rest. After the collision, some of the protons bounce back with a speed of 1.2 x 107 m/s.

a) Find the ratio M/m.

b) Calculate the speed of the nuclei after the collision.

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