The speed of an object is doubled. As a result its kinetic energy is: a. doubled

Question

The speed of an object is doubled. As a result its kinetic energy is: a. doubled; b. quadrupled; c. halved; d. quartered. A 40 Newton object is released from a height of 10 meters. Just before It hits the ground its kinetic energy in joules is most nearly: a. 400; b. 3920; c. 12800; d. zero. As an object falls to the ground its potential energy; a. increases; b. decreases; c. remains the same. A box which weighs 10 newtons is dragged across a level floor by a horizontal force of three newtons for a distance of five meters. The work done In joules is most nearly; a. 15; b. 20. c. 50: d. 500. As the time required to raise a given weight six feet decreases, the power needed; a. increases; b. decreases; c remains the same.

Explanation / Answer

1. Quadrupled E = 1/2 m v^2 2. E = m g h = W h = 40 * 10 = 400 3. Decreases since total energy is constant E = Potential + Kinetic 4. W(work) = F * d = 3 * 5 = 15 5. Increases P = work/time total work is constant

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