just solve for a in
4100t - 17/2 t^2 = 9400t - a/2 t^2
a/2 t^2 = 5300t + 17/2 t^2
at^2 = 10600t + 17t^2
a = 10600/t + 17
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 +4100 m/s, while rocket B has an initial velocity of +9400 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 -17 m/s2. What is the acceleration of rocket B?
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