Problem

A rock is thrown upward from a platform. Its height above the ground, in feet, / seconds a...

A rock is thrown upward from a platform. Its height above the ground, in feet, / seconds after being thrown is given by h(t) = −16t2 + 40t + 5.

a. What is the velocity of the rock after one second? Interpret your answer.


b. What is the velocity of the rock after two seconds? Interpret your answer.


c. When is the velocity of the rock zero?


d. When does the rock hit the ground?

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