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1. The work required to stretch a spring changes linearly with the amount of strech?

2. The kinetic energy of an object increases linearly as the velocity of the object increases?

3. Kinetic energy is proportional to speed?

4. Kinetic energy is proportional to mass?

5. Kinetic energy is a scaler quantity?

6. Power is a vector quantity?

7. Work done by the force of friction can be positive or negative?

8. Work done by a force on an object can be positive or negative quantity?

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