A plot of potential energy and kinetic energy versus displacement x for a block attached to a spring obeying Hooke's law is
a hyperbola
a straight line
a parabola
an ellipse
The graphs are parabolas as the potential and kinetic energy vary as x2.
A particle moves in a straight line with retardation proportional to its displacement. Its loss in kinetic energy for a displacement ‘x’, is proportional to