A projectile is fired from the surface o...

A projectile is fired from the surface of earth of radius R with speed `lambda v_S` in radially outward direction (`lambda<1`). Neglecting air resistance, the maximum height from centre of earth is

a. `R/(lambda^2 +1)`

b. `lambda^2 R`

c. `R/(1-lambda^2)`

d. `lambda R`

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