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If a ball is thrown vertically upward with an initial velocity of

`160f(t)/(s)`

, then its height after

`t`

seconds is

`s=160t-16t^(2)`

. (Consider up to be the positive direction.) (a) What is the maximum height (in ft) reached by the ball?

`◻`

`ft`

(b) What is the velocity (in

`f(t)/(s)`

) of the ball when it is

`384ft`

above the ground on its way up?

`◻`

`f(t)/(s)`

What is the velocity (in

`f(t)/(s)`

) of the ball when it is

`384ft`

above the ground on its way down?

`◻`

`f(t)/(s)`