Is it possible for a system to have negative potential energy?     "Yes, as long as the kinetic energy is positive."     "Yes, as long as the total energy is positive."     "Yes, since the choice of the zero of potential energy is arbitrary."     "No, because the kinetic energy of a system must equal its potential energy."

When an 81.0 kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.00×10³ J. By how much does the potential energy of a 18.0 kg child increase when the child climbs a normal staircase to the second floor?

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?

To stretch an ideal spring 5.00 cm from its unstretched length, 17.0 J of work must be done. (k= 1.36 x 10^4 N/m) a) What magnitude force is needed to stretch the spring 5.00 cm from its unstretched length? b) How much work must be done to compress this spring 4.00 cm from its unstretched length?  c) What force is needed to compress the spring this distance?

A roller-coaster car of mass 1.50 × 103 kg is initially at the top of a rise at point Ⓐ. It then moves 35.0 m at an angle of 50.0° below the horizontal to a lower point Ⓑ. (a) Find both the potential energy of the system when the car is at points Ⓐ and Ⓑ and the change in potential energy as the car moves from point Ⓐ to point Ⓑ, assuming y = 0 at point Ⓑ. (b) Repeat part (a), this time choosing y = 0 at point Ⓒ, which is another 15.0 m down the same slope from point Ⓑ.

A child throws a stone upwards. While the stone is moving upwards the gravitational force does positive work on it and the gravitational potential energy increases. the gravitational force does positive work on it and the gravitational potential energy decreases. the gravitational force does negative work on it and the gravitational potential energy increases. O the gravitational force does negative work on it and the gravitational potential energy decreases.

In the figure, a block slides down an incline. As it moves from point A to point B, which are 4.0 m apart, force F→ acts on the block, with magnitude 3.6 N and directed down the incline. The magnitude of the frictional force acting on the block is 14 N. If the kinetic energy of the block increases by 43 J between A and B, how much work is done on the block by the gravitational force as the block moves from A to B?

true or false?  When an object slides across a surface and comes to a stop, the amount of energy removed is equal to the amount of work performed by friction.

A helicopter lifts a 65 kg astronaut 18 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. (a) How much work is done on the astronaut by the force from the helicopter? (b) How much work is done on the astronaut by her weight? (c) What is the kinetic energy? (d) What is the speed of the astronaut just before she reaches the helicopter? m/s

If the skateboarder has 3000J of Potential Energy at his current position. What will his potential and kinetic energy be when he has moved down 4m from his starting position?   Question 6 options:   Potential Energy = 1000 J, Kinetic Energy = 2000 J   Potential Energy = 1500 J, Kinetic Energy = 1500 J   Potential Energy = 2000 J, Kinetic Energy = 1000 J   Potential Energy = 0 J, Kinetic Energy = 3000 J