Ted throws an object into the air with an initial vertical velocity of 54 ft/s from a platform that is 40 ft above the ground. About how long will it take the object to hit the ground?
a. 1 s
b. 2 s
c. 3 s
d. 4 s

Question

Ted throws an object into the air with an initial vertical velocity of 54 ft/s from a platform that is 40 ft above the ground. About how long will it take the object to hit the ground?
a. 1 s
b. 2 s
c. 3 s
d. 4 s

anonymous · Answer

@mathmate

mathmate · Answer

Use the same equation to solve for t, with different parameters.
v=+54'/s
x0=40'
don't forget to correct the half-acceleration from -4.9 to -16.1'/s^2

anonymous · Answer

what? I honestly don't understand. I really don't. I just need the answer.

mathmate · Answer

X0 is the initial height, taking ground level as 0'.

mathmate · Answer

Sorry, you got the wrong guy or the "just answer" responses.
See also code of conduct : "I will encourage and guide those needing help, and not just give them an answer"

anonymous · Answer

thanks for the help.

mathmate · Answer

You're welcome!  Remember, you only have to find the values and substitute into the given kinematics equation.

anonymous · Answer

I got it! I got it right! thank you!

mathmate · Answer

You're welcome!  :)
I'm glad you worked it out...on your own!