Question

Sandra throws an object into the air with an initial vertical velocity of 38 feet per second, from a platform that is 30 feet above the ground. How long will it take the object to hit the ground?









A.
2 seconds







B.
4 seconds







C.
1 second







D.
3 seconds
D, right? @Dscdago @IMStuck

Answer 1

@aaronq

Answer 2

using : \(\sf y_f=y_i+v_y\Delta t +\dfrac{1}{2}a_y(\Delta t)^2\)

\(\sf 0=30~ft+(38~f/s)\Delta t +\dfrac{1}{2}(-32~ft/s^2)(\Delta t)^2\)

then \(\sf \Delta t=3~s\)

so yeah, youre right

Answer 3

Yes, it's 3.