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A ring of mass m can slide over a smoot...

A ring of mass `m` can slide over a smooth vertical rod as shown in figure. The ring is connected to a spring of force constant `k = 4 mg//R`, where `2R` is the natural length of the spring . The other end of spring is fixed to the ground at a horizontal distance `2R` from base of the rod . If the mass is released at a height `1.5 J` then the velocity of the ring as it reaches the ground is

A

`(mgR)/(2),2 sqrt(gR)`

B

`mgR, 2 sqrt(gR)`

C

`(mgR)/(2), sqrt(2 gR)`

D

`(mgR)/(2),sqrt(gR)`

Text Solution

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The correct Answer is:
A
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