- #1
Gliese123
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Homework Statement
From a height 40 meters up, one throw a ball with the velocity of 20 m/s. The elevation is 0°. How far does the ball come?
vo = 20 m/s
x = 40 meters
α = 0°
(g=9.82)
Homework Equations
y = v0 × t × sinα - (9.82×t2)/2
x= v0×t×cosα
The Attempt at a Solution
I put what I know in there
40 = 20×t×sin0° - (9.82×t2)/2
=>
80/9.82 = t2
=>
√(80/9.82) = t = 2.85 s (Is that right?)
Then I put all I know in the other formula to get x:
x= v0×t×cosα
x = 20×2.85×cos0°
x=57 meters
(Doesn't that feel a little too short?)
I've no answer to this question and I would be really glad if someone could confirm that this is correct calculated :)
Edit: There's no air resistance