Pre-calculus question?

Posted on 2015-09-23 07:03:00 in Math by KEVIN

If air resistance is neglected, a projectile shot straight upward with an initial velocity of 45 m per sec will be at a height s in meters given by the function s(t) = ?4.9t2 + 45t where t is the number of seconds elapsed after projection.

Determine the following (Round answers to three decimal places)

a.) After how many seconds will the projectile reach its maximum height?

b.) What is the maximum height(in meters)?

c.) How long will it take for the projectile to hit the ground(in seconds)?

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