- #1
carltonblues
- 15
- 0
1)A ball is thrown upward with an initial velocity of v = 20 m/s. How long is the ball in the air? What is the greatest height of the ball? When is the ball 15 m
above the ground?
1) I have figured out
t total = 4.08s
greatest height = 20.4m
For the last bit (Finding the time when x=15m), I am having trouble. I know the answer but cannot work it through.
Do I use s = ut+1/2at^2 for it?
If I do, it won't work out because the 20.4 m has to come into it, doesn't it?
Please help!
above the ground?
1) I have figured out
t total = 4.08s
greatest height = 20.4m
For the last bit (Finding the time when x=15m), I am having trouble. I know the answer but cannot work it through.
Do I use s = ut+1/2at^2 for it?
If I do, it won't work out because the 20.4 m has to come into it, doesn't it?
Please help!