A person with a mass of 42kg starts from rest at position A, as shown, and then slides down to positions B, C, and D. Calculate the gravitational potential energy of the person at A

You are meeting your friends at a 49er football game. You start near the top of the seating area (8.9 m above the field) and walk down the steps to where your friends are sitting (3.4 m above the field). Assume that your mass is 60 kg. What is the change in your gravitational potential energy as you walk down the steps? Give your answer in J and report your answer to 1 decimal place. Make sure you include the sign if that is important for your answer.

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Wile E Coyote (below) has a mass of 12.5 kg and compresses a spring with spring constant 150 N/m by 0.90 m before he stops touching the floor and hence is shot out by the spring. a) What is the potential energy stored in the spring at maximum compression? b) What is the speed of the Wile E Coyote right after the spring returns to its uncompressed position? c) What is the work done by the spring on Wile E Coyote?

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A 1.5 kg ball is thrown upward with a velocity of 6 m/s. a). What is the kinetic energy of the ball as it is thrown upward? b). What is the gravitational potential energy of the ball when it reaches its highest point? c). To what height above the thrower’s hand will the ball rise? (for c only, round answer to nearest hundredth).

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1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?

A 1.85 kg book is sliding along a rough horizontal surface. At point A it is moving at 3.50 m/s, and at point B it has slowed to 1.45 m/s. 1. If -0.700 J of work is done on the book from B to C, how fast is it moving at point C? 2. How fast would it be moving at C if 0.700 J of work were done on it from B to C?

Suppose a 1300-kg elevator car is lifted a distance 45 m by its cable at a constant speed, assuming the frictional force on the elevator has a constant value of 1350 N. 1.Calculate the work done on the elevator by its cable, in joules.  2.Calculate the work done by the gravitational force on the elevator, in joules, during this process.  3.Calculate the total work done on the elevator, in joules.