. `rolling from position A down the fixed hemispherical surface (see figure) to position


A small ball starts rolling from position A down the fixed hemispherical surface (see figure) to position C. There is friction on path AB while path BC is frictionless. If KA, KB, KC represent kinetic energy of the ball and hA, hB, hC height of the ball at points A, B and C, then

A small ball starts

A small ball starts

Best Answer

Since part bc is frictionless, torque on the ball on this part is zero and hence its angular velocity will be constant on this part. Further from conservation of mechanical energy
hc < ha.

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