A curved suface is shown in figure. The portion BCD is free of friction. There are three spherical balls of identical radii and masses. Balls are released from rest one by one from A which is at a slightly greater height than C.
Wioth the surface AB, ball 1 has large enough friction to cause rolling down without slipping, ball 2 has a small friction and ball 3 has a negligible friction.
(a) For which ball is total mechanical energy conserved?
(b) Which ball(s) can reach D?
(c )For ball which do not reach D, which of the balls can reach back A?

Options

A. 1 and 2
B. 1
C. 2
D. Cannot be predicted

Answer

C