Students are playing with the 4.13 kg bowling ball hung from the ceiling of the classroom. When at rest, it hangs 0.63 m above the floor. The cord is 1.87 long. The students pull the ball up and to the side and then let go. It swings back and forth like a pendulum. The students pull it so it is 1.40 m above the ground.
a) What is the ball's velocity when it's at the lowest point? Assume no air resistance.
b) What's the tension in the string at this point?
The Attempt at a Solution
I don't know if I did a right, and I don't know how to do b...