A rubber-wheeled 50 kg cart rolls down a 60 degree concrete incline. Coefficient of rolling friction between rubber and concrete is μr = 0.02. A) What is the cart's acceleration if rolling friction is neglected?
B) What is the cart's acceleration if rolling friction is included?

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.