A body of mass `m` is suspended from a spring fixed to the ceiling of an elevator car. The stiffness of the spring is `x`. At the moment `t=0` the car starts going up with an acceleration`w`. Neglecting the mass of the spring , find the law of motion `y(t0` of the body relative to the elevator car if `y(0)-0` and `y(0)=0`. Consider the following two cases `:`
`(a)` `w=const`,
`(b)` `w=alphat, ` where `alpha `is a constant.