# Velocity equation

1. Dec 5, 2009

### The Trice

I have a body of 1kg of mass being acted on by a force of magnitude equal (10000/(y^2))
[where y is the distance between the body and a certain point] and this force is in the direction pointing to the point
so depending on what mentioned above :-
what i know is : f = a = (1000 0/(y^2))
and that Dy/Dt = V (velocity)

What is needed is the function of the velocity in terms of time.

2. Dec 5, 2009

### omkar13

As you have said a=10000/(y^2)
==>Dv/Dt=10000/(y^2)
if y is a fixed value and independent of time ,integrating with respect to t

v=10^5(t)
-------
y^2

3. Dec 5, 2009

### The Trice

ofcourse y is not a constant value since the distance which is y decreases as the body moves towards the point

4. Dec 5, 2009

any help ??

5. Dec 6, 2009

### The Trice

is it this hard i just want to know the velocity equation between body attracted to a point or another body!!!!

6. Dec 6, 2009

### Redbelly98

Staff Emeritus
You probably need to find the velocity as a function of distance y first. Using energy conservation would help with that.