An archer puts a 0.30-kg arrow to the bowstring. An average force of 201 N is exerted to draw the string back 1.3 m. Assuming that all the energy goes into the arrow, with what speed does the arrow leave the bow?

Kelli weighs 420 N, and she is sitting on a playground swing that hangs 0.40 m above the ground. Her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. How fast is Kelli moving when the swing passes through its lowest position?

A 0.075-kg arrow is fired horizontally. The bowstring exerts an average force of 65 N on the arrow over a distance of 0.90 m. With what speed does the arrow leave the bow?

A 98.0-N sack of grain is hoisted to a storage room 50.0 m above the ground floor of a grain elevator. How much work was done?

Assume that the force of a bow on an arrow behaves like the spring force. In aiming the arrow, an archer pulls the bow back 50 cm and holds it in position with a force of 150 N. If the mass of the arrow is 50 g and the "spring" is massless, what is the speed of the arrow immediately after it leaves the bow?

In the 1950s, an experimental train, which had a mass of 2.50 x 10⁴ kg, was powered across a level track by a jet engine that produced a thrust of 5.00 x 10⁵ N for a distance of 509 m. Find the work done on the train.