Physics Problem 2-D Motion - Circular Motion Radial Acceleration - Earth's Orbit

The radius of the earth’s orbit around the sun (assumed to be circular) is 1.50 x 10^8 km, and the earth travels around this orbit in 365 days.
(a) What is the magnitude of the orbital velocity of the earth, in m/s?
(b) What is the magnitude of the radial acceleration of the earth toward the sun, in m/s^2?
(c) Repeat parts (a) and (b) for the motion of the planet Mercury (orbit radius = 5.79 x 10^7 km, orbital period = 88.0 days).

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