Here's the question you clicked on:
smiley41909
The Gateway Arch in St. Louis is 640 ft high. How long would it take an object to fall freely from the top?
Do we know anything about the object like weight?
acceleration of free fall (a) = 9.8m/s² distance (s) 640ft = 195m initial velocity (u) = 0m/s we need time (t) Now use the kinematics equation: s = ut + 1/2at² This is actually a physics question
The function st 16t2 is used to approximate the distance s, in feet, that an object falls freely from rest in t seconds.
what is the function? st 16t2?
Well then, there you have it. I guess that's how it is in ft. Never worked in US units before, so can't say. s = 16t² 640 = 16t² solve for t