Reply to remarks of R Cross on 'A comparative study of two types of ball-on-ball collision'

摘要

In this letter, I explain an error which was identified to me in my use of the equation v_n = e~nv_0 in the first method of measuring the coefficient of restitution of two colliding Newton's cradle balls. In fact, for this particular scenario, the correct equation is shown to be v_n =(1+e/2)~n v_0. However, it is further shown that, in this case, the resulting error is small and the thesis of the paper remains valid.