1. An object is pushed with a force of 400 N for 20 meters; what is the work done on the object? Solve using W=F*d (page 107) 2. A truck has a mass of 3,000 kg and is going 3 m/s. What is the kinetic energy of the truck? Solve using KE = (1/2)mv2 (page 116)

3. A book has a mass of 6 kg and is 15 m above the ground; what is its potential energy? Solve using GPE = mgh (g = 9.81 m/s^2; page 118)

4. A power mower does 120,000 J of work in 1200 s. What power does it develop? Solve using P = E/t (page 126)​

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)