- #1
WeldingStuff
- 6
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Homework Statement
A ball is thrown upwards at 20 m/s at an angle of 15 degrees to ground.
How long until the ball touches the ground?
Givens for vertical:
Acceleration = -9.8m/s2
v1= 5.2 m/s (20SIN15)
v2=0
displacement=0
t=?
Givens for horizontal
Acceleration= 19.3 m/s (20COS15)
Displacement= ? (perhaps work back from displacement on horizontal to get the time?)
t=?
Homework Equations
DeltaD= (V1)(DeltaT) + (.5)(A)(DeltaT)
Answer should be 0 OR 1.1s for T ( I don't understand how you are to get two answers)
The Attempt at a Solution
0=(5.2)(detlaT) +(0.5)(-9.8)(deltaT)[/B]
?? ?? ??
The textbook suggests to use this equation and not the other 4.
Also I am not sure if displacement is zero for the horzontal given that V=D/TStumped for hours.
Nobody I can ask for help