3.5 Exercise 21

The function $h \left(t\right) = - 4.9 t^{2} + 30 t$ gives the height $h$ of a ball (in meters) thrown upward from the ground after $t$ seconds. Suppose the ball was instead thrown from the top of a 10-m building. Relate this new height function $b \left(t\right)$ to $h \left(t\right) ,$ and then find a formula for $b \left(t\right) .$