The wheels’ average angular acceleration (rads/sec/sec)?

Question

A car starting from rest accelerates up to 50km/sec in 6 seconds. If the car’s wheels have a diameter of 0.8 meters, what are the wheels’ average angular acceleration (rads/sec/sec)?

Answer 1

Did you mean 50 km/hr in 6 seconds?
50*3.6=m/sec

Using
v=v0+a*t
a=50*3.6/6
a=30 m/s^2

since alpha=a/r
alpha=30/.4
=75 rad/sec^2

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