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A spherical rigid ball is released from rest and starts rolling down an inclined plane from height h
7 m as shown in the figure. It hits a block at rest on the horizontal plane (assume elastic collision). If
the mass of both the ball and the block is m and the ball is rolling without sliding, . then speed of
the block after collision is close to
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c) 10m/s
mv
2
+
2
1
IW
2
=mgh
Total(K.E)=P.E
∴
2
1
mv
2
+
2
1
(
5
2
mR
2
)
R
2
V
2
=mgh
∴v=
7
10gh
On collision V
ball
=V
block
∴V=
7
10×9×7
=10m/s
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