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13. A body has maximum range R1 when projected up the inclined plane. The same body when projected down the inclined plane, it has maximum range R2. Assuming equal speed of projection in each case and the body is projected on the inclined plane in the line of the greatest slope the maximum range R on horizontal ground (same speed of projection) can be
A) R = R1R2 B) R = R1 + R2 C) R = R 1 R 2 R 1 + R 2 D) R = 2 R 1 R 2 R 1 + R 2
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