CBSE Class 10 Answered

Since the speed is constant V and the direction is not changing, therefore the net acceleration is zero.

For downward motion, the friction force will act in upward direction,

Net force = Weight - Buoyancy - Friction = 0

Mg = B + F

Now for upward motion, the friction force will act in downward direction,

Net force = Buoyance - Weight - Friction = 0

B = M'g + F .............(M', remaining mass after removal of some mass)

B - F = M'g

Therefore using the above two equation, we can find M-M', the mass removed,

And it is, 2F/g.

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