# Physics Problem Proof With Friend

1. Oct 11, 2004

### Tom McCurdy

We are trying to decide if this is true
we are trying to prove that t
equals

$$t= \sqrt{ \frac{2Vo^2}{g}}$$
however we think the teacher may have misspoke and it should be
$$t= \frac{Vo\sqrt{2}}{g}$$

$$Vosin45-gt=0$$

$$Vosin45=gt$$

$$t= \frac{Vosin45}{g}$$

since you need to muliply by 2 since its only time up and you need time up and down

$$t= \frac{\frac{2V_0\sqrt{2}}{2}}{g}$$

$$t= \frac{2V_0\sqrt{2}}{2g}$$

$$t= \frac{Vo\sqrt{2}}{g}$$

Last edited: Oct 11, 2004
2. Oct 12, 2004

### arildno

As you may have noted, your prof.'s units don't add up, so his answer MUST be wrong!

3. Oct 12, 2004

### Tom McCurdy

YES! I am happy, I got yelled at by my friend when I suggested that he was wrong.... we will see who is laughing at the end