A stunt pilot in an air show performs a loop-the-loop in a

Question

Compute all parts of given problem:

Problem: A stunt pilot in an air show performs a loop-the-loop in a vertical circle of radius 2.83 x 10³ m. During this performance the pilot whose weight is 603 N, maintains a constant speed of 2.10 x 10² m/s.

Part A: When the pilot is at the highest point of the loop determine his apparent weight.

N

Part B: At what speed will the pilot experience weightlessness?

m/s

Part C: When the pilot is at the lowest point of the loop determine his apparent weight.

N

I want help to find at what speed the pilot experience weightlessness.