A jet plane is moving vertically upward with a velocity of \( 500 \...

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A jet plane is moving vertically upward with a velocity of \( 500 \mathrm{~km} \mathrm{~h}^{-1} \). The gases are ejecting from the rear of the jet plane with a velocity of \( 1500 \mathrm{~km} \mathrm{~h}^{-1} \) with respect to the jet. Find the velocity of the gases w.r.t. a person on the ground.
\( \mathrm{P} \)
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