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Questions  

In the figure, the ball A is released from rest when the spring is unstretched. For the block of mass M to leave contact with ground at some stage, the minimum mass of A must be

a
2 M
b
M
c
M/ 2
d
4 M

detailed solution

Correct option is C

Loss in gravitational P.E = Gain in elastic P.E.

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The curved portions are smooth and horizontal surface is rough. The block is released from P. At what distance from A, it will stop (if μ = 0.8)?


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