If an object dropped off the top of a tall building
falls vertically with constant acceleration. If s is the distance
of the object above the ground (in feet) t seconds after its release,
then s and t are related by an equation of the form
S=a+bt^2
where a and b are constants.
If the object is 240 feet
above the ground after 1 second and 192 feet above the
ground after 2 seconds.

A) Find the constants a and b.
(B) How high is the building?
(C) How long does the object fall?

Please help me to figure this problem out! If you show each step it will help me to do it on my own!

THANKS.. ALL HELP IS APPRECIATED!!!