From january 26, 1977, to september 18, 1983, george meegan of great britain walked from ushuaia, at the southern tip of south america, to prudhoe bay in alaska, covering 30 600 km. in meters per second, what was the magnitude of his average velocity during that time period?

Hello there.

A machinist turns the power on to a grinding wheel, which is at rest at time t = 0.00 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 25 rad/s. The wheel is run at that angular velocity for 37 s and then power is shut off. The wheel decelerates uniformly at 1.5 rad/s2 until the wheel stops. In this situation, the time interval of angular deceleration (slowing down) is closest to:

A) 17 s