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Q. A game show contestant won a prize by pushing a bowling ball 20m using her nose. The amount of work done was 1470J. How much force did the contestant exert on the ball?

Q. A spherical mirror is polished on both sides. When the convex side is used as a mirror, the magnification is +1/4. What is the magnification when the concave side is used as a mirror, the object remaining the same distance from the mirror?

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