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In my experience, physics problems such as these want you to start from basic and derived formulas that you have learned and manipulate them into the equation they want you to prove.
A sphere of mass m1 mooving with speed u1 colides directly witha similar sphere of mass m2 moving with speed u2 in the same direction (u1>u2). The coefficient of restitution between the two spheres is e. Show that the loss of kinetic energy E due to collision satisfies the equation