A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.37 x 105 N. In being launched from rest it moves through a distance of 80.6 m and has a kinetic energy of 4.56 x 107 J at lift-off. What is the work done on the jet by the catapult?

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.5× 104 kg, and the force causes its speed to change from 7400 to 5600m/s. (a) What is the work done by the force? (b) If the asteroid slows down over a distance of 2× 106 m determine the magnitude of the force.

Spiderman, whose mass is 78.0 kg, is dangling on the free end of a 12.4-m-long rope, the other end of which is fixed to a tree limb above. By repeatedly bending at the waist, he is able to get the rope in motion, eventually getting it to swing enough that he can reach a ledge when the rope makes a 0 = 59.4° angle with the vertical. How much work was done by the gravitational force on Spiderman in this maneuver? kJ

A 0.25 slug (3.6 kg) object begins moving at 46 mph (20.6 m/s). A force slows it down to 37 mph (16.5 m/s) while it ends up moving to the right relative to the original direction of motion. (a) Assuming no other forces on the object, what is the work done by the force?(b) Is energy being added or removed from the system by the force?