Problem is I can't find the direction of the velocity of this paricle, the only thing I can find is its magnitude.
In the question above, it asks for the velocity, so only magnitude is not enough.
Please show me how to find its direction. Thanks.
Homework Statement
http://img690.imageshack.us/img690/5817/problem001.jpg
Homework Equations
Chain rule : dv/dt=dv/dr*dr/dt
Integration
The Attempt at a Solution
I can only find the speed (the magnitude of the velocity), that is...