4. The length of a body is measured as 3.51 m, if the accuracy is 0.01mm, then the
percentage error in the measurement is
a) 351%
b) 1%
c) 0.28%
d) 0.035%

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to: