A particle of mass 'm' is projected with a velocity v = kV e (k < 1) from the surface of the earth. ( V e = escape velocity) The maximum height above the surface reached by the particle is

1. A. R ( k 1+k ) 2
2. B. R 2k 1+k
3. C. Rk 2 1-k 2
4. D. R ( k 1-k ) 2

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