A car leaves an intersection after a light turns green. It starts from rest and reaches a speed of 13.4 m/s in 5.0 s. The radius of a tire of the car is 0.25 mDetermine the average rotational acceleration of the tire.

Answer 1

acceleration=changespeed/time=13.4/5 m/s^2
alpha=acceleration/radius=above/.25
=4*13.4/5 rad/sec^2

average, divide by 2, or wavg=2/5*13.4 rad/sec^2

Answer 2

find acceleration by dividing 13.4 m/s by 5.0 s. the divide by the radius, .25m