A 17,000kg jet takes off from an aircraft carrier via a catapult (Fig. 639a}. The gases thrust out from the jet's engines exert a constant force of 130 kN on the jet; the force exerted on the jet by the catapult is plotted in Fig. 639b. Determine the work done on the jet: (a) by the gases expelled by its engines during launch of the jet; and (b) by the catapult during launch of the jet. | see that there are answers to these questions. but I'm not understanding part B. What would be helpful is if there was an explanation for what the process is forfinding the area under a graph curve to get the work done on the jet by the catapult. x (m) (17) FIGURE 639 Problem 14