A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.3 m/s and the tension in the rope is T = 21.8 N.

Question

A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.3 m/s and the tension in the rope is T = 21.8 N. 
Return to the original mass. What is the tension in the string at the same vertical height as the peg (directly to the right of the peg)? 
so far I have the rope is .2696m long and the mass is .74074kg
I don't know how to figure this out.

bobpursley · Answer

I don't understand where the mass is, and how is it hanging when horizontal. As I understand it, if the pendulum is held horizontal, there shoud be no tension in the rope when horizontal.