6. A 2,500 kg airplane can accelerate on the runway from rest to 250 mph in 15 seconds. What is the power provided by the engine? Assume that all the energy goes to the plane's kinetic energy. What other energies are neglected in this assumption?

A 2kg package is moves up along a 10 m ramp AC inclined at 15' with an initial speed of 5 m/s. Knowing that the coefficient of sliding friction between the package and the incline is 0.2, answer the following questions: 10 m B 15° d 1. What force/s do/does NOT do any work on the package as it moves along the incline? 2. What is the work done by friction on the package as it moves a distance x along the incline? 3. What is the change in the kinetic energy from A to B if at position the package becomes zero? 4. What is the change in the potential energy from A to B if at position B the velocity of the package 5. What is the maximum distance that the package will move up the incline?

2. A 1050 J of work is done by a post-person when pushing a parcel with a mass of 33.2 kg with a horizontal force at a constant speed across a level, rough surface for 8.17 m. Draw a free-body diagram. b. What is the horizontal force applied by the post person? c. What is the coefficient of kinetic friction between the parcel and the surface?

. Calculate the potential energy of a 75 Kg boulder sitting at the edge of a cliff that is 210 meters from the ground (yf=0). b. If the boulder is suddenly pushed over the side of the cliff what is the velocity of the boulder when it is 50 meters from the ground?