Question 1100672
.
<pre>
1)  When will the height be 62 feet?

    Solve the equation h(t) = 62,  which is  -16t^2+77t+7 = 62.


    Find its roots (if they exist).  



2)  When will the object reach ground?

    It will happen when h(t) = 0,  or, which is the same, when

    -16t^2+77t+7 = 0.


    Solve this quadratic eq-n and use its positive root.
</pre>