A pulley one metre in diameter rotating at 600 r.p.m. is brought to rest in 80 sec. by a constant force of friction on its shaft. How many revolutions does it makes before coming to rest?

A pulley one metre in diameter rotating at 600 r.p.m. is brought to re

1.	A pulley one metre in diameter rotating at 600 r.p.m. is brought to rest in 80 sec. by a constant force of friction on its shaft. How many revolutions does it makes before coming to rest?
A.	200
B.	300
C.	400
D.	500
Answer» D. 500