posted by math question? .
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 +5800 m/s, while rocket B has an initial velocity of +9100 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 -12 m/s2. What is the acceleration of rocket B?