physics

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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 -

    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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