Revolutions......help

Question

a bicycle being repaired is turned upside down, and one wheel is rotated at a rate of 50rpm. if the wheel slows uniformly to a stop in 12s, how many revolutions does it make during this time?

Answer 1

Just answered this one about 2 hours ago.

average rpm = (50 + 0)/2 = 25 rpm

time = 12 sec = 12/60 min = 1/5 min

revolutions made by the wheel = 25 * 1/5 = 5

hope to answer you well. keep smiling. bye.