Homework Help: Projectile motion -- how long does it take the projectile to reach maximum height?

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1. Jul 22, 2017

Cortana

• Member warned that posters must show what they have tried
1. The problem statement, all variables and given/known data
A projectile was launched at 70 m/s at an angle of 45 degrees above the horizontal, how long does it take the projectile to reach maximum height?

2. Relevant equations
Vyo= initial vertical velocity Vo=initial velocity

3. The attempt at a solution
I tried using the equation Vxo=VoSIN(theta)

Last edited by a moderator: Jul 23, 2017
2. Jul 22, 2017

cnh1995

Welcome to PF!
No.
You need to show what you've tried so that we can see what went wrong.

3. Jul 22, 2017

Cortana

I don't even know where to start tbh, i don't even know which formula to use

4. Jul 22, 2017

cnh1995

5. Jul 22, 2017

haruspex

Did you mean that? It could be right, depending on how exactly you are defining theta. What angle do you think it represents?
Double check your source for that equation.

6. Jul 23, 2017

thejosh

try using trig ratios and SUVAT equations