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A stone with mass 0.8kg is attached to one end of a string 0.9m long. The string will break if its tension exceeds 600N. The stone is whirled in a horizontal circle, the other end of the string remains fixed. Find the maximum speed, the stone can attain without breaking the string.

Given,
Mass of stone (m)=0.8kg
Length of string (r)=0.9m
Maximum tension (Tmax)=600N
Maximum speed (vmax)=?

For maximum speed at which the string will not break,
Tmax=mv2maxr
v2max=Tmaxrm=6000.90.8=675
v=25.98m/s

∴ The maximum speed (vmax)=25.98/m/s
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