A ball of mass '144" "km' moving with a speed of '72" "km' per hour is hit by a bat that changes its speed to '100" "g' per hour. Find the change in the kinetic energy of the ball.

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_