Question 1031288
.
The equation below expresses the approximate height,"h", in meters, of a coin "t" seconds after it is flipped vertically upward 
from a height of 1.5 meters with an initial velocity of 1 meter per second. After how many seconds will the coin land on the ground ?

h=-4.9t^2+t+1.5
~~~~~~~~~~~~~~~~~~~~~~~~~


<pre>
Coin lands the ground  <----->  h = 0.

So, solve the quadratic equation  {{{-4.9t^2+t+1.5}}} = {{{0}}}  for t, and you will get the answer.

Use the quadratic formula.
</pre>