7. A space ship is far from the solar system and has a large communication dish. It travels with velocity to the right of 100 ms⁻¹. The ship, dish and fuel have a mass of 1000 kg. The ship encounters a shower of sticky meteorites of average mass 0.01 kg traveling with velocity of 200 ms⁻¹ to the left. There are 1000 meteorites per second hit the dish and stick to it. As the first meteorite strikes the dish, the rocket engines are fired to eject 10 kg of fuel per second at a velocity relative to the ship of 500 ms⁻¹ to the left. Calculate the acceleration of the ship at that instant.
(A) 3 ms⁻² right
(B) 2 ms⁻² right
(C) 3 ms⁻² left
(D) 1 ms⁻² left
(E) 1 ms⁻² right

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