Which of the following are true? The work required to pick up and carry a brick

Question

Which of the following are true?
The work required to pick up and carry a brick onto a truck is the same as sliding it up a frictionless inclined plane.

Work is always equal to the change in kinetic energy.

If a frictionless closed system loses potential energy, it must gain kinetic energy.

Which of the following are true? The work required to pick up and carry a brick onto a truck is the same as sliding it up a frictionless inclined plane. Work is always equal to the change in kinetic energy. A spring with a constant of 20 N/m must be stretched 2 times as far as a spring with a constant of 40 N/m to have the same energy stored. If a frictionless closed system loses potential energy, it must gain kinetic energy.

Explanation / Answer

true

false

true

true

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