- #1

Draggu

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## Homework Statement

A ball is thrown vertically upward from the roof of a building 68.6 m high, with an initial velocity of 24.5m/s. Its height above the ground at time, t=>0, is given by

h(t) = 68.6 + 24.5t-4.9t^2

b) When does the ball reach it's maximum height?

c) Find the maximum height reached by the ball.

## Homework Equations

## The Attempt at a Solution

Well, i lent my friend the note i had for this and he went away on vacation, therefore I'm stuck with these 2 questions.

Some notes: ball hits the ground in 7 seconds, when the velocity is -44.1m/s

v(t) = -9.8t+24.5

a(t)=-9.8