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Critical points for a ballistic projectile

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If an object is thrown upward from 15 meters above ground with an initial velocity of 18 meters per second, then its height h above ground after t seconds after it is thrown is given by


Use your calculator to answer the following (round to the nearest hundredth, if necessary):

a) Sketch the graph.
b) How high is it after 4 seconds?
c) What is the maximum height the object reaches
d) How many seconds does it take to reach this height?
e) how many seconds does it take to reach the ground again?

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The solution is detailed, step-by-step in the attached PDF. The expert examines critical points for a ballistic projectiles.

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