1.

A point particle of mass m, moves alongthe uniformly rough track PQR as shownin the figure. The coefficient of friction,between the particle and the rough trackequals Îź. The particle is released, from rest,from the point P and it comes to rest at apoint R. The energies, lost by the ball, overthe parts, PQ and QR, of the track, areequal to each other, and no energy is lostwhen particle changes direction from PQto QR.

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