Aboy whirls a stone in a horizontal circle of radius 1.7 m and at height 1.9 m above level ground. the string breaks, and the stone flies off horizontally and strikes the ground after traveling a horizontal distance of 8.9 m. what is the magnitude of the centripetal acceleration of the stone while in circular motion?

Explanation:

As we know that stone is revolving in horizontal circle

so here height of the stone is H = 1.9 m

now by kinematics we can find the time to reach it at the ground

now we have

now we have

now the speed of the stone is given as

now for finding centripetal acceleration we have

we know that radius of circle is

R = 1.7 m

now we have

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.