A disc of mass 3m and a disc of mass m are connected by a massless spring of stiffness k. The heavierdisc is placed on the ground with the spring vertical and lighter disc on top. From its equilibriumposition, the upper disc is pushed down by a distanceand released. Then(A) if> 3mg/k, the lower disc will bounce up(B)if= 2mg/k, maximum normal reaction from ground on lower disc = 6 mg.(C) if= 2mg/k, maximum normal reaction from ground on lower disc = 4 mg.(D)if> 4mg/k, the lower disc will bounce up

Abhinav Gupta , 7 Years ago

Grade 11