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## Homework Statement

A stone of mass 4 Kg is attached to a string , its length 10 m .it moves in a horizontal circular path. The tension force of the string becomes 160 N then calculate its velocity.

## The Attempt at a Solution

Its quite easy to solve when supposing the tension force = centripetal force while this is not given in the problem so how to solve it??

If tension = centripetal force

them 160 = m V^2/r

160= 4 * V^2 /10

then V = 20 m/s

so my problem that"it is not necessary for the tension force to be equal to the centripetal force" so could you help me??

thanks in advance