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A smooth ring A of mass m can slide on a...

A smooth ring A of mass m can slide on a fixed horizontal rod. A string tied to the ring passes over a fixed pulley B and carries a block C of ma `M(=2m)` as shown in figure. At an instant the string between the ring and the pulley makes an angle `theta` with the rod. a. Show that, if the ring slides with a pspeed v, the blockdescends with speed `v cos theta`, b. With whast acceleration will the ring starts moving if the system is released from rest with `theta= 30^0`

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