# Thread: Physics help please?

1. ## Physics help please?

In my physics class we did a lab where we shot a ball bearing from a mechanism. I am wondering how I can calculate the distance it traveled (even thought I measured it) as well as how I can calculate the initial velocity.

The notes I took are as follows:

Height from floor to bottom of ball bearing: 85.4 cm
Average distance ball traveled (out of 10 shots): 250.24 cm

Also, how could I calculate time if I wanted to?

Thanks a ton!

2. was the initial velocity horizontally directed?

3. yeah it was horizontally directed

4. Originally Posted by colerelm1
yeah it was horizontally directed
$t = \sqrt{\frac{2h}{g}}$

$v_0 = v_x = \frac{\Delta x}{t} = \Delta x \cdot \sqrt{\frac{g}{2h}}$

5. Thanks!

how could I calculate distance?

On a seperate note: what if the ball was shot at a 22 degree angle, how could I solve for the distance then?

6. Originally Posted by colerelm1
Thanks!

how could I calculate distance?

On a seperate note: what if the ball was shot at a 22 degree angle, how could I solve for the distance then?
1. $\Delta x = v_x \cdot t$

you would need the initial velocity to find it.

2. same equation as above ... given the initial velocity, you'll need to solve the equation $\Delta y = v_{0y}t - \frac{1}{2}gt^2$ for $t$