# Projectile motion cannon shot

1. Apr 27, 2016

1. The problem statement, all variables and given/known data
Warren weights 70 kg and is shot out of a cannon at 25 degrees above the horizontal. the cannon barrel tip is 1.34m above the ground and the cannon has a mass of 203kg.
What is Warren's initial launch velocity?

2. Relevant equations
I don't even know

3. The attempt at a solution
I think that this problem is missing some info, or i'm really bad at physics

Last edited by a moderator: Apr 27, 2016
2. Apr 27, 2016

### ProfuselyQuarky

Doesn't your textbook give you a list of equations for whatever you're learning?

3. Apr 27, 2016

We don't go by the textbook, she teaches us with labs and stuff, there are several equations but none of them fit

4. Apr 27, 2016

Also this is review for my final and we learned it a while back, i'm taking a practice test and need to get this question right

5. Apr 27, 2016

### ProfuselyQuarky

Post the equations that you do know.

6. Apr 27, 2016

d = vi•t + 0.5*a*t2
vf = vi + a•t
vf2 = vi2 + 2*a•d
that's about it, i can't find a lot of formulas pertaining to initial launch velocity

Last edited by a moderator: Apr 27, 2016
7. Apr 27, 2016

### SteamKing

Staff Emeritus
What happens to Warren after he leaves the cannon? Without knowing that, you can't determine what Warren's initial launch velocity was.

8. Apr 27, 2016

### ProfuselyQuarky

What numbers in your problem matches the variables in those equations?

9. Apr 27, 2016

### Staff: Mentor

If that is the complete problem statement, the problem does not make sense.
Is there something else given? Maybe in a second part, or in a sketch of the problem?

10. Apr 28, 2016