A jogger runs counterclockwise around a path of radius 90.0 m at constant speed. He makes 1.00

Question:

A jogger runs counterclockwise around a path of radius 90.0 m at constant speed. He makes 1.00 revolution in 188.4 s. At t = 0, he is heading due east.
(a) What is the jogger's instantaneous velocity at t = 376.8 s?
(b) What is his instantaneous velocity at t = 94.2 s?