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Which of the following statements is incorrect? (a) Kinetic energy may be zero, positive or negative. (b) Power, energy and work are all scalars.

Which of the following statements is incorrect? (a) Kinetic energy may be zero, positive or negative. (b) Power, energy and work are all scalars. (c) Potential energy may be zero, positive or negative. (d) Ballistic pendulum is a device for measuring the speed of bullets.

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