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12.25 A ball is thrown up on the surface of a moon. Its height above the lunar surface (in feet) afterseconds is given by the

12.25 A ball is thrown up on the surface of a moon. Its height above the lunar surface (in feet) afterseconds is given by the formula h=441t-9/2t2

a)Find the time that the ball reaches its maximum height

time: __________ seconds

b)Find the maximal height attained by the ball

height: __________ feet

Please show work :)

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