Question

A 625-kg racing car completes one lap in 14.3 s around a circular track with a radius of 55.0 m. The car moves at constant speed.
(a) What is the acceleration of the car?

Answer 1

d = 2pi*r,
d = 6.28*55 = 345.6m = Linear distance,

d = 0.5*at^2 = 345.6 m,
0.5a*(14.3)^2 = 345.6,
102.2a = 345.6,

a = 345.6 / 102.2 = 3.38 m/s^2.

Answer 2

A 615 kg racing car completes one lap in 14.3 s around a circular track with a radius of 40.0 m. The car moves at constant speed.
(a) What is the acceleration of the car?