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An object thrown vertically upward from the surface of a celestial body at a velocity of 21 m/sec reaches a height of s=211-0.312 meters in t seconds.
a. Find the object's velocity and acceleration as functions of time.
b. How long does it take the object to reach its highest point?
c. How high does the object go?
d. When does the object first reach half its maximum height?
e. How long is the object aloft?

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