Answer:
(a) In case of ball
2, a part of mechanical energy is converted into internal energy of ball and
the surface oil which it slides. Therefore, mechanical energy (i.e. K.E. +
P.E.) is conserved for balls 1 and 3.
(b)
Only ball 3 can reach D.
(c)
Balls 1 and 2 cannot reach point A.
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