A small sphere is given vertical velocity of magnitude v 0 = 5m/s and it swings in vertical plane about end of massless string. If max. tension string can withstand is equal to twice of weight of sphere, then angle ' 
' with vertical at which string will break is –
A
cos –1 
B
cos –1 
C
60 0
D
30 0
Text Solution
Verified by ExpertsThe correct answer is:
B
T– mg cos θ = 
………(i)
mg λ cos θ = 
mv 2 – 
mv 0 2 ………(ii)
T = 2 mg ………(iii)
∴ cos θ = 
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