1. An intern pushes a 72 kg patient on a 15 kg gurney, producing an acceleration of 0.60 m/s^2.
A) How much work does the intern do by pushing the patient and gurney through a distance of 2.5 m? Assume the gurney moves without friction.
B) How far must the intern push the gurney to do 140 J of work?
2. A 4.10 kg box is lifted vertically from rest to a distance of 1.60 m with a constant applied force of 52.7 N.
A) Find the work done by the applied force
B) Find the work done by gravity
C) Find the final speed of the box
3. In the bottom of the ninth inning, a player hits a 0.15 kg ball over the outfield fence. The ball leaves the bat with a speed of 36 m/s and a fan in the bleachers catches it 7.2 m above the point where it was hit. Assuming frictional forces can be ignored...
A) Find the kinetic energy of the ball when it is caught
B) Find its speed when it is caught
4. It's the Cyclone-Hawkeye football game. On a touchdown attempt, a 95.0 kg Hawkeye running back runs towards the end-zone at 3.75 m/s. A 111 kg, Cyclone linebacker moving at 4.10 m/s meets the runner in a head-on collision. If the two players stick together...
A) What is their velocity immediately after the collision?
B) What are initial and final kinetic energies of the system?