A disc of mass 3 m and a disc of mass m are connected by a massless spring of stiffness k. The heavier is disc placed on the ground with the spring vertical and lighter disc on top from its equilibrium position the upper disc is pushed down by a distance `delta` and released. Then.
A. if `deltagt3mg//k`, the lower disc will bounce up
B. if `delta=2mg//k`, maximum normal reaction from ground on lower disc`=6mg`
C. IF `delta =2mg//k`, maximum normal reaction from ground on lower disc `=4mg`
D. If `delta gt4mg//k`, the lower disc will bounce up
