A pendulum formed by a 2m long string and a bob of mass 1kg is raised to an angle of 60^o from the vertical, as shown in the figure. It is then released from rest. Ignore air resistance.

a. (10 points)

What will be the speed of the bob when it is at the lowest position?
 
 
 
 
 
 
 
 
 
 
 
 
 

b. (15 points)

What is the tension in the string when the bob is at its lowest position?