How many variables are required to define the position of a body in space?
a) 3
b) 2
c) 1
d) 0

Answer

C

Explanation

Given, N=mg
As shown in the ure
`(mv^2)/R=mg`
`rarr v^2=gR`……i

Total energy at point A
`=energy at P
`1/2kx^2=1/2mv^2+mgR`
`x^2=(mgR+2mgR)/k`
[because `v^2=gR]`
`rarr x^2=3mgR/k`
`rarr x=sqrt(((3mgR))/k)`