A 1400 kg car drives up a 16 m high hill. The car's speed at the bottom and top are 21 m/s and 13 m/s respectively. If the car's engine does 80 kJ of work then what is the work done by friction?

Starting from rest, a 1.7x104 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.35 N on it. This force does 2.7x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground? (b) How far upward does the flea move while it is pushing off? Ignore both air resistance and the flea's weight. (a) Number i (b) Number i Units Units

A 1100 kg car drives up a hill that is 16.2m high. During the drive, two nonconservative forces do work on the car: (i) the force of friction, and (ii) the force generated by the car's engine. The work done by friction is −2.91×105J; the work done by the engine is 6.74×105JFind the change in the car's kinetic energy from the bottom of the hill to the top of the hill

During a tug-of-war match, team A pulls on team B by applying a force of 1100 N to the rope between them. The rope remains parallel to the ground. How much work does team A do if they pull team B towards them by a distance of 4 m?

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A 0.31-kg particle has a speed of 3.0 m/s at point A and kinetic energy of 8.2 J at point B. (a) What is its kinetic energy at A? (b) What is its speed at point B? m/s (c) What is the total work done on the particle as it moves from A to B?

A puck with a mass of 159.0 g is sliding with an initial velocity 31.0 m/s.  The puck enters a section of rough ice and slows to a speed of 15.1 m/s.  What is the magnitude of the work done on the puck by the rough ice?  Express your answer in Joules to 1 decimal place.

A force of 17 Ib is required to hold a spring stretched 3 in. beyond its natural length. How much work W is done in stretching it from its natural length to 9 in. beyond its natural length?

A weight lifter bench‑presses a 150.0 kg barbell from his chest to a height equal the length of his arms, 0.850 m. How much work does he do? How many food calories does the weight lifter use if he does this lift 35 times? Assume the weight lifter does no work in letting the barbell drop back to his chest.

A man pushes a 85.9-N crate a distance of 3.7 m up a long frictionless ramp at a constant speed.  His pushing force is parallel to the ramp.  The ramp makes a 30.0-degree angle with the horizontal.  What is the work done by the man in pushing the crate? Give your answer in joules, rounded to one decimal place.