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Q. A stone is projected from ground level at 84 m/s. Its speed when it reaches its highest point is 45 m/s. Find out the angle of its projection.

Q. A metal bar, pivoted at one end, oscillates freely in the absence of a magnetic field. But, when it oscillates between the poles of a magnet, its oscillations are quickly damped. Why? (Such magnetic damping is used in a number of practical devices).

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