A model rocket is launched from the ground at rest. The acceleration of the rocket is å = 90 ŷ– . After 1.5 s2 т seconds, the rocket fuel is expended, and the acceleration of the rocket returns to å = -9.8 ŷ–. a) Find the velocity of the rocket just as the fuel is expended (Answer: 135ŷ“) b) Find the height of the rocket just as the fuel is expended (Answer: 101ŷ m) c) How long does it take the rocket to reach maximum height after the fuel is expended? (Answer: 13.8 s)

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Projectile Motion