A motorcyclist runs out of gas on a level road 250 m from the gas station. She pushes the 220-kg motorcycle with a constant force of 150 N. How much work does she do?

A horse pulls a 300 kg sled for 50 m over level ground at constant speed, exerting a force of 3000 N at 30° above horizontal. How much work is done by the horse on the sled? 150 kJ 2940 J 130 kJ

A car with the mass m=1600kg coasts down an incline from an initial height of h=7m with an initial speed v0=15m/s. When it reaches the bottom of the incline its speed is 20m/s. How much work did friction do on the car? This is the full question. No acceleration given. Assistance please.

You pick up a barbell with weights (total mass: 100.0 kg) from the ground to approximately 0.800 m above the ground (roughly equivalent to doing a deadlift). Once it has been lifted, you then carry it 10.0 m at a steady speed before stopping and finally gently lowering the barbell back to the ground. How much work have you done on this barbell in J?

A 12.0 kg box is given an initial push that starts it sliding across the floor. It eventually comes to a stop. If the box has an initial velocity of 3.5 m/s, how much work is done by friction to cause it to come to a stop? (Yes, you are correct, you do not know the coefficient of friction.)

The graph in the figure below shows the magnitude of the force ex- erted by a given spring as a function of the distance x the spring is stretched. How much work is needed to stretch this spring: (a) a distance of 5.0 cm, starting with it unstretched, and (b) from x - 2.0 cm to x = 7.0 cm? F (N) x (cm) 1 2 3 4 5 6 67 8 350 300 250 200 150 100 50

A 23 N rock is dropped from a height of 11.5 m, and the velocity right before hitting the ground is 13.50 m/s. What is the work done by the air friction?

A dog (of mass 50 kg) is happily sliding down a hill that has a coefficient of kinetic friction of 0.2. The hill has a slope of 20 degrees. Assuming that the dog is letting gravity do all the work, what is the magnitude of the dog's acceleration down the slope? 0.51 O 3.51 O 2.51 1.51 600

A person pulls a 10 kg luggage along a level road for 5 m by exerting a force of 20 N at an angle of 30° with the horizontal shoulder through a vertical distance of 1.5 m and carries it for another 5 m. How much work does he do in taking the luggage on his shoulder?