Aparticle of charge is released from rest at the point cm on an x axis. the particle begins to move due to the presence of a charge q that remains fixed at the origin. what is the kinetic energy of the particle at the instant it has moved 43 cm if (a) q = +20 μc and (b) q = -20 μc?

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: