Homework Statement
An object with mass m start its journey on x-axis at point (-l,0) with velocity v.
The object feels force which depends on the object's distance to origin.
After T second it reaches the origin. What is T?
Homework Equations
x(t=0)=-l
v(t=0)=v
f(x)=-kx
x(t=T)=0
T=?
The...