Statement I: The velocity of centre of mass with respect to centre of mass frame is zero.
Statement II: Velocity of centre of mass with respect to ground's reference frame is always zero.

I is right; II is wrong

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I is wrong; II is right

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Both are right

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Both are wrong

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Solution

The correct option is A I is right; II is wrong
Imagine yourself moving at the same velocity as of the centre of mass of the rigid body. With what velocity would you see the centre of mass moving.
Zero. Yes. of course!

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(q) At $t = 0$ , a person at point A is moving with constant velocity (towards right) and the plank is at rest , then for his motion between point A and B.	2. Centre of mass must move with constan velocity
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m + M

List-I	List-II
(p) Person moves with constant acceleration (towards right)	1. Centre of mass must remain at rest
(q) At $t = 0$ , a person at point A is moving with constant velocity (towards right) and the plank is at rest , then for his motion between point A and B.	2. Centre of mass must move with constan velocity
(r)	3. Acceleration of centre of mass may be zero.
(s)	4. Centre of mass must have a component of acceleration in the downward direction