1) Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 150,000 kg and a velocity of 0.300 m/s, and the second having a mass of 125,000 kg and a velocity of 0.120 m/s. (The minus indicates direction of motion.)

What is their final velocity (in m/s)? (Enter a number.) m/s

2) During an ice show a 40.0 kg skater leaps into the air and is caught by an initially stationary 60.0 kg skater.

(a)

What is their final velocity in meters per second assuming negligible friction and that the 40.0 kg skater's original horizontal velocity was 4.00 m/s? (Enter a number.) m/s

(b)

How much kinetic energy is lost in joules? (Enter a number.) J