Two rockets are flying in the same direction and are side by side at the instant their retrorockets fire. Rocket A has an initial velocity of + 6400 m/s, while rocket B has an initial velocity of + 9800 m/s. After a time t both rockets are again side by side, the displacement of each being zero. The acceleration of rocket A is - 15 m/s2. What is the acceleration of rocket B?
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