Hint - if it ask W=AE The Work - Energy Principle work , con W = Fd EK = 1/2 mv2 how the e Each of the following problems makes use of the Work - Energy Principle. Remember that whenever work Ep = mgh chang is done to a system, the change in energy is equal to the work done. Mathematically the principle is stated vice as W = AE. When solving the following problems, consider each question and the given information. Solve the problems using good problem solving techniques. Look for conversions in the problems. 1. What work must be done to stop a 75 g arrow traveling at a rate of 45 m/s? EK = 1/2 mv ? kg =0. 075 kg 2. A 1500 kg car is lifted by an elevator a total of 15.0 m. What was the work done to accomplish this task? 3. A pitcher exerts a force of 105 N through a distance of 220 cm on a baseball. What is the total energy imparted to the ball? 4. If the ball in #3 has a mass of 150 g, what is its velocity in m/s upon leaving the pitcher's hand?Name Date Period The Work - Energy Principle 5. If the catcher stops the ball (from problem #3) and his glove moves a total distance of 2.5 cm, what is the average force exerted by the glove to stop the ball? 6. A 35.0 kg mass drops from a height of 10.0 m. If all of its energy is transferred to a 7000 g brick on a seesaw, how high will this brick go