A bit of a repost, but I have a different question. This is the question given:
If an object is thrown downward at 26 m/s from the top of a building, 102m high, the equation relating to displacement (meters) and time (seconds) is:
Find the time for an object to reach the ground from the top. Use g=-9.81
So I have come up with
Unfortunately I keep getting 2 negative solutions.
I was given this explaination:
The initial velocity is (you are working with s positive upwards) and , so your equation for displacement is:
which I can tell you has exactly one positive root (and in consequence one negative root, but that is not the one you want).
My question is, how do I figure out I need to use -26t? Am I supposed to look at the given formula and change 26t to a negative number because I am dropping an object?