In a stunt, three people jump off a platform and fall 9.9 m onto a large air bag. A fourth person at the other end of the air bag, the "flier," is launched 17 m vertically into the air. Assume all four people have a mass of 75 kg.

(a) What fraction of the mechanical energy of the three jumpers is transferred to the mechanical energy of the flier?

(b) What is the total momentum of the three jumpers just before they land on the air bag? Let upward be the positive direction.

(c) What is the momentum of the flier just after launch?

(d) Notice that momentum is not conserved during this stunt, unless you include the Earth. What impulse is delivered to the jumpers-flier system by the Earth at the instant of the launch?