During hand-pumped rail car races, a speed of 27.9 km/h has beenachieved by teams of four people. A car that has a mass equal to379 kg is moving at that speed toward a river when Carlos, thechief pumper, notices that the bridge ahead is out. All four people(each with a mass of 75.0 kg) simultaneously jump backward off thecar with a velocity that has a horizontal component of 4.00 m/srelative to the car. The car proceeds off the bank and falls intothe water a horizontal distance of 22.1 m from the bank.
a) How long is the time of fall of the rail car?
b) What is the horizontal component of the velocity of thepumpers when they hit the ground?
