# Keep Moving !!!!!

**Classical Mechanics**Level 2

The potential energy of a particle of mass \(5kg\) moving in the \(XY~plane\) is given by \(U=(-7x+2y)J\) where \(x\) and \(y\) are given in \(metres(m)\) . If the particle starts from rest from the origin , then what is the velocity of the particle at time \(t=2s\) ?????

Note : Give your answer in \(m/s\) and avoid the units.....just write the answer as an integer !!!!!