Using quadratic formula to find time [projectile motion]

[camcognito]

1. Homework Statement
I'm doing lab, and to start we have to find ΔX of a projectile launched an angle. The first step for us is to find time, and to make it easier our teacher recommended us to first set the angle to zero, and find time like that.

I don't have enough X information to find time yet, so I have to use the Y components I think

X
ΔX= .153 M
Φ = 0°
Y
AY = 9.8m/s²
ΔY = -.96 M.
Φ = 0°
V_iy = 0 ?

Homework Equations

I'm supposed to take the equation ΔY = V_iyt + 1/2ayt² and make it into quadratic formula. For some reason t = √2ΔY/AY won't work and we're supposed to use quadratic formula

The Attempt at a Solution

[/B]
Since I'm launching the projectile from 0°, I thought the V_iy would equal 0. However, when I try to plug that into the quadratic formula, there's a 0 for one of the variables and it doesn't work.

I'm getting -4.9t² + 0 + .96 = 0; I think I'm doing something wrong in the middle but I'm not sure what to fix.

 

[ehild]

1. Homework Statement
I'm doing lab, and to start we have to find ΔX of a projectile launched an angle. The first step for us is to find time, and to make it easier our teacher recommended us to first set the angle to zero, and find time like that.

I don't have enough X information to find time yet, so I have to use the Y components I think

X
ΔX= .153 M
Φ = 0°
Y
AY = 9.8m/s²
ΔY = -.96 M.
Φ = 0°
V_iy = 0 ?

Homework Equations

I'm supposed to take the equation ΔY = V_iyt + 1/2ayt² and make it into quadratic formula. For some reason t = √2ΔY/AY won't work and we're supposed to use quadratic formula

The Attempt at a Solution

[/B]
Since I'm launching the projectile from 0°, I thought the V_iy would equal 0. However, when I try to plug that into the quadratic formula, there's a 0 for one of the variables and it doesn't work.

I'm getting -4.9t² + 0 + .96 = 0; I think I'm doing something wrong in the middle but I'm not sure what to fix.

The equation -4.9t² + 0 + .96 = 0 is correct, just solve it for t.

 

[camcognito]

The equation -4.9t² + 0 + .96 = 0 is correct, just solve it for t.

Wow... it was that simple. Thanks, I've been overthinking a lot of equations recently