$($a$)$ Calculate the buoyant force $($in N $)$ on a $2\mathrm{.}70$ L helium balloon.

N $($upward$)$

$($b$)$ Given the mass of the rubber in the balloon is $1\mathrm{.}40$ g $,$ what is the net vertical force $($in N $)$ on the balloon if it is let go$?$ You can neglect the volume of the rubber.

N $($upward$)$

$+$

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