Posted by **Rachel** on Thursday, January 31, 2013 at 1:07am.

An object thrown in the air on a planet in a distant galaxy is at height

s(t) = -20t^2 +67t +42 feet at time t seconds after it is thrown.

a) From what height was the object thrown?

b) With what velocity was the object thrown?

c) What is the acceleration due to gravity on this planet?

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