A disc is performing pure rolling on a smooth stationary surface with constant angular velocity as shown in figure. At any instant, for the lower most point of the disc
A
Velocity is v, acceleration is zero
B
Velocity is zero, acceleration is zero
C
velocity is v, acceleration is 
.
.
D
velocity is zero, acceleration is 
Text Solution
Verified by ExpertsThe correct answer is:
D
As the disc is in combined rotation and translation, each point has a tangential velocity and a linear velocity in the forward direction.
From figure
v net (for lowest point , ) = v – R ω = v – v = 0.
and Acceleration = 
+ 0 = 
(Since linear speed is constant )
Hence .
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