Published by:
CGP EDU Academic Team
Published on: September 13, 2026
A horizontal disk is rotating with angular velocity ' 
' about a vertical axis passing through its centre. A ball is placed at the centre of groove and pushed slightly. The velocity of ball when it comes out of the groove –
A
R
B
C
R
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let us consider motion of ball with respect to disk
Net force along groove = m ω 2 r sin θ
= m ω 2 r 
= m ω 2 x
ma = m ω 2 x
⇒ v 
= ω 2 x
⇒ v = 
= 
+
∴ 
= 
= 
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