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Just part C. I found

A, B!

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Ch 5 HW: Problem 5.3 - Vertical Circular Motion
A student twirls a 125-gram rock tied to the end of a 45.0-cm long string in a vertical circle. It
takes the rock 0.360 seconds to complete one revolution, and the student's hand (the center of
the circle) is 1.20 meters above ground level.
a) What is the tension in the string when the rock is at the top of the circle?
b)
What is the tension in the string when the rock is at the bottom of the circle?
C)
When the string makes a 30.0 angle below the horizontal and moving upwards, the string
is cut, and the rock follows a ballistic trajectory from that point. How much time passes
before the rock hits the ground?

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