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A particle is fired vertically upward with a speed of 15 Km/s from the surface of earth. The
speed with which it moves in interstellar space is ___ (Take escape speed from surface of earth as
$11.2 Km / s$ )

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zero

$3.8 Km / s$

$≃ 4 Km / s$

$≃ 10 Km / s$

answer is C.

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Detailed Solution

$V = {KV}_{e}, V^{1} = V_{e} \sqrt{K^{2} - 1}$

$K = \frac{15}{11.2} \Rightarrow V^{1} ≃ 10 {kms}^{- 1}$

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