A motorcycle with a mass of 875 kg is moving with an eastward velocity of 70 m/s and collides with another motorcycle with the same mass. The two motorcycles get tangles together in the collision and afterwards their combined mass had a velocity of 40 m/s west. what is the initial velocity of the second motorcycle? (include direction)

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

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:

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?