A 1900 kg car is initially traveling 20 m/s. The driver presses down on the accelerator pedal and the engine does 1.00 MJ of work on the car, causing it to speed up. (a) What was the initial kinetic energy of the car? (b) What was the final kinetic energy of the car? (c) Find the final speed of the car.

Can the work done by Friction be zero? In a case where static friction exists, the object does not move and the change in kinetic energy is also zero? W = Fd = ?KE = 0? What did I do wrong?

A 50.2-g golf ball is driven from the tee with an initial speed of 58.0 m/s and rises to a height of 22.4 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.23 m below its highest point? (a) Number (b) Number Units Units

A 700 kg dragster accelerates from rest to a final speed of 120 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower of the car engine?a) watts=  b) horsepower=

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Estimate the kinetic energy (in GJ) of a 96,000 metric ton aircraft carrier moving at a speed of at 22 knots. You will need to look up the definition of a nautical mile to use in converting the unit for speed, where 1 knot equals 1 nautical mile per hour.

Rank the following bodies in order of their kinetic energy, from least to greatest along with reasons. (i) a 4.0-kg body moving at 10.0 m/s; (ii) a 2.0-kg body that initially was at rest and then had 60 J of work done on it; (iii) a 2.0-kg body that initially was moving at 8.0 m/s and then had 40 J of work done on it; (iv) a 4.0-kg body that initially was moving at 10 m/s and then did 80 J of work on another body.

Consider the following scenario. A car for which friction is not negligible accelerates from rest down a hill, running out of gasoline after a short distance (see below). The driver lets the car coast farther down the hill, then up and over a small crest. He then coasts down that hill into a gas station, where he brakes to a stop and fills the tank with gasoline. Identify the forms of energy the car has, and how they are changed and transferred in this series of events.

Assume that before the accident happened, the car was going at a constant velocity of 60Km/h on a level highway for a distance of 10.0km. The car accelerated briefly to 70.0Km/h to pass another car and then returns to 60.0Km/h as it descends the other side of the hill, even though the driver has taken her foot off the accelerator. Describe the energy transformations taking place when the engine was not doing the work.