A jet airplain travelling at the speed of ( 500 mathrm{km} / mathrm{hr} ) ejects its products of combination at the speed of ( 1500 mathrm{km} / mathrm{hr} ) relative to jet plane. What is the speed of later wrt observer on the ground?

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Let speed = 500km/hr 

Work speed ( =x mathrm{km} / mathrm{hr} )
Relative speed ( =500+x ) [both in opposite direction] 

So (,500+x=1500 )
[
x=1000 mathrm{km} / mathrm{hr}
]

Deposit direction  SO, reject = - 1000km/hr

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