d =0.5gt^2.
24 = 0.05 * 9.8t^2,
24 = 4.9t^2,
t^2 = 24 / 4.9 = 4.9,
t = sqrt(4.9) = 2.2 s.
Bill kicks a rock off the top of his apartment
building. It strikes a window across the street
12 m away.
The acceleration of gravity is 9.8 m/s2 .
If the window is 24 m below the position
where Bill contacted the rock, how long was
it in the air?
Answer in units of s.
1 answer