A rocket is fired with a speed u = 3 g R from the earth surface. What will be its speed at interstellar space ?

Question

A rocket is fired with a speed u = 3 g R from the earth surface. What will be its speed at interstellar space ?, zero, 2 g R, 7 g R, 3 g R

MARKS App · Accepted Answer

From conservation of mechanical energy K . E . + P . E . s u r f a c e = K . E . + P . E . i n f i n i t y 1 2 m 3 g R 2 + - G M m R = 1 2 m v ∞ 2 + 0 or v ∞ = 7 g R

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