pendulum

Consider a pendulum swinging back and forth on a string. Use
a motion diagram analysis and a written explanation to
answer the following questions.
a. At the lowest point in the motion, is the velocity zero or
nonzero? Is the acceleration zero or nonzero? If these vectors
aren't zero, which way do they point?
b. At the end of its arc, when the pendulum is at the highest
point on the right or left side, is the velocity zero or
nonzero? Is the acceleration zero or nonzero? If these vectors
aren't zero, which way do they point?

I've seen so many problems like this, but I just don't kow how to do it!