Please help problem on circular motion and conservation law.?

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1. If a wheel has a constant angular velocity of 12 radians per second, goes through an angular displacement of 37.7 radians.
A) How long does it take the wheel to go through the 37.7 radians?
B) How many complete rotations did the wheel make going through this displacement?

2. A 1200kg car crashes into a tree and stops, if the car was initially going 30m/s and the crash takes 0.8 seconds, what is the average force acting on the car during the crash?
 
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