In the system shown in the figure, suppose the block has a mass of 2.5 kg, the spring has a force constant of 550 N/m, and the coefficient of kinetic friction between the block and the floor is 0.18. (Figure 1) Find the work done on the block by the spring and by friction as the block is moved from point A to point B along path 2.

A car with mass 1520 kg is traveling down the highway at a speed of 18 m/s when the driver slams on the brakes due to an accident up ahead. The car eventually comes to rest.According to the work-energy theorem the work is related to the change in kinetic energy, Wnet = Δ KE = KEfinal - KEinitial.(a) Using the work-energy relationship, determine how much net work is done on the car from the brakes? Report the magnitude of the the work (positive value) even though the work from brakes will be negative since the car is slowing down._____ J(b) The brakes apply a force of 24000 N to the car in order to make it stop. Using the fact that W = F d and the fact that the you found the work done (magnitude) by the brakes in part (b), determine the stopping distance, d, of the car.____ m

A chain of length 11 m and a mass per unit length of 0.6 kg/m initially lies coiled on the ground. Find the work done (in Joules) in raising one end of the chain to a height 15 m above the ground. Use g = 9.81 m/s² for the acceleration due to gravity. Write only the numerical answer in the box below. Do not include the units. To be graded correct, your answer must be correct to three significant digits. This question accepts numbers or formulas. Plot | Help | Switch to Equation Editor | Preview

A 2 kg object is thrown downward on an incline with initial velocity of 5m/s. After 12 meter displacement, its velocity becomes 8m/s. What is work done on the object by friction during the motion? (friction is between object and inclined surface). (Please type all steps of your solution and show the formulas you have used.)