A spaceship going away from the Earth at half the speed of light fires from its nose a rocket we travel with a speed of 0.4 c with reference to the sea the speed of the rocket with reference to the earth is
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Vr/s=0.4c
Vs/e=0.5c
Vr/e=Vr/s +Vs/e
Vr/e=0.4c+0.5c
=0.9c
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