please help me with this I have 30 minutes left

Question 3 (1 point) i Listen A 1.35 kg grinding wheel 25.0 cm in diameter is spinning counterclockwise at a rate of 22.0 revolutions per second. When the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 85.0 s to come to a rest. How many radians does the wheel turn through as it comes to a stop? Your Answer: Answer units