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Question

A particle of mass m is tied to a string of length l on a smooth incline plane of inclination θ=30. Particle is imparted a velocity of Vo at the bottom most point so that particle moves in a circle of radius l.

A
Minimum value of Vo so that particle complete circle is 5gl2
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B
For V0=5gl2 tension in string will never become zero
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C
Maximum tension in string if Vo=5gl2 is 3mg
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D
Minimum tension in string for Vo=2gl is not zero
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Solution

The correct options are
A Minimum value of Vo so that particle complete circle is 5gl2
C Maximum tension in string if Vo=5gl2 is 3mg

Take g1=g sin θ=g2
At top posion,

T = 0
m/g1=m/v2l
v=gl=g2l
By conservation of energy, 12m/v2+2m/gl=12m/V2o
g1l2+2g1l=V2025g1l=V20
V0=5g1l=52gl
If the speed is 52gl, or below, the tension becomes zero.
The maximum tension occurs at the bottom most position.
T=mg+mV20l, when V0=52gl, T becomes 3mg.






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