# The Naked Scientists Forum

### Author Topic: How would i go about finding the velocity of a ball?  (Read 1142 times)

#### rohini ragunathan

• Guest
##### How would i go about finding the velocity of a ball?
« on: 28/10/2009 21:30:03 »
rohini ragunathan  asked the Naked Scientists:

hi

I have a problem from an in-class lab where i have to find the initial velocity of the ball. Given is the horizontal and vertical displacement of the projectile.

Dy=100cm
Dx=200m

0(theta)= 15degrees.

_________
/
/
________/_0=15degrees
|
|
|
|
|-100cm
|
|
_ _ |_ _ _ _ _ _ _ _ _ _ _ _ _ _
Dx= 200m

Find the initial velocity.

What do you think?

#### Mr. Scientist

• Neilep Level Member
• Posts: 1451
• Thanked: 2 times
##### How would i go about finding the velocity of a ball?
« Reply #1 on: 29/10/2009 05:49:56 »
I don't usually reply to these questions because it is purely homework... but, i'll let you work it out:

Right, first of all you know that 0(theta)= 15degrees - so are you not given an initial velocity for an angle above the horizontal, because to my knowledge you needed it to work out horizontal and vertical components of the initial velocity?

#### The Naked Scientists Forum

##### How would i go about finding the velocity of a ball?
« Reply #1 on: 29/10/2009 05:49:56 »