A conical pendulum is constructed with a string 2.5 m in length. The pendulum is set in horizontal circular path about the vertical axis. If the angular velocity of the conical pendulum is a constant 2.8 rad/s, then the angle the string makes with the vertical axis is
A. 48 degrees.
B. 60 degrees.
C. 71 degrees.
D. 75 degrees.
E. 80 degrees.
B. 60 degrees.
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