Problema Solution
An empty railway car of mass 15,000 kg is coasting at 3.5 m/son a level track. A load of 5000 kg of coal is dropped into the car from above at zero horizontal speed from above. Find the new velocity of the car plus coal.
Answer provided by our tutors
v = m1v1/(m1+m2)
v = 15 000*3.5/(20 000) = 2.625 m/s