physics
posted by Sam .
A boy whirls a stone in a horizontal circle of radius 1.9 m and at height 2.1 m above ground level. The string breaks, and the stone flies horizontally and strikes the ground after traveling a horizontal distance of 10 m. What is the magnitude of the centripetal acceleration of the stone while in circular motion?

The centripetal acceleration was V^2/R, where R = 1.9 m.
You need to compute V, the speed when in circular motion. First compute the time T that it takes the stone to fall 1.9 m.
1.9 m = (1/2) g T^2
V = Vx, the horizontal component of velocity after the string breaks
V = (10 m)/T 
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