Particle with non zero acceleration with zero velocity at that instant - example Is it even possible for a particle to have those properties?
How can an object's instantaneous speed be zero and it's instantaneous acceleration be nonzero? I'm studying for my upcoming physics course and ran across this concept - I'd love an explanation.
Is $|xy|$ differentiable in $(0,0)$? Is $f(x,y) = |xy|$ differentiable in $(0,0)$? I have no idea how to approach this problem.