What will be the reading of spring balance in the figure shown in following situations. (`g = 10 m//s^2`)

(i) `a=0` , `v=0`
(ii) `a=0` , `v=2m//s`
(iii) `a=0`, `v=-2m//s`
(iv) `a=2m//s^2`, `v=0`
(v) `a=-2m//s^2`, `v=0`
(vi) `a=2m//s^2`, `v= 2m//s`
(vii) `a=2m//s^2`, `v=-2m//s`
(viii) `a=-2m//s^2`, `v=-2m//s`.