4. At one instant of time a rocket is traveling in outer space at 2500 m/s and is exhausting fuel at a rate of 100 kg/s. If the speed of the fuel as it leaves the rocket is 1500 m/s, relative to the rocket, the thrust is:
(A)0 N
(B)\( 1.0 \times 10^5 \) N
(C)\( 1.5 \times 10^5 \) N
(D)\( 2.9 \times 10^5 \) N
(E)\( 2.5 \times 10^5 \) N

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