# Circular motion of a ball and string

1. Oct 28, 2008

### physics_geek

1. The problem statement, all variables and given/known data
A ball on the end of a string is whirled around in a horizontal circle of radius 0.366 m. The plane of the circle is 1.50 m above the ground. The string breaks and the ball lands 2.20 m (horizontally) away from the point on the ground directly beneath the ball's location when the string breaks. Find the radial acceleration of the ball during its circular motion.

2. Relevant equations
a = v^2/r
T = 2pi(r)/v

3. The attempt at a solution
I know the radial acceleration is towards the center of the circle
what i do not understand is that they do not give me time or velocity.
so how i figure it out!?

am i supposed to be assuming something?

2. Oct 28, 2008

### Epsillon

You gota calculate velocity using kinematics.

3. Oct 28, 2008

### physics_geek

o kinematics

but that would require something like d = .5at^2 rite?

4. Oct 28, 2008

### Epsillon

Basicly just treat it as a projectile motion question to get intial velocity then that initial V is your velocity for the circular motion.

5. Oct 29, 2008

### physics_geek

well if im to treat it as a projectile motion question

that does not really help me figure out initial velocity...im sorry
im just really confused

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