physics
posted by Anonymous .
A model rocket leaves the ground, heading straight up at 45m/s .
Part A
What's its maximum altitude?
Express your answer to two significant figures and include the appropriate units.
Part B
Find its velocity at 1 s?
Express your answer to two significant figures and include the appropriate units.
Part C
Find its altitude at 1 s?
Express your answer to two significant figures and include the appropriate units.
Part D
Find its velocity at 4 s?
Express your answer to two significant figures and include the appropriate units.
Part E
Find its altitude at 4 s?
Express your answer to two significant figures and include the appropriate units.
Part F
Find its velocity at 7 s?
Express your answer to two significant figures and include the appropriate units.
Part G
Find its altitude at 7 s?
Express your answer to two significant figures and include the appropriate units.

physics 
Steve
well, you know that the height is
y = 45t  4.9t^2
Now just use that parabola to answer the questions.
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