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## Homework Statement

assume the balloon is a spherical shape whose radius is 2.5m and total mass of 15 kg

a) what is the initial upward acceleration of the ballon when it is released from sea level

## Homework Equations

## The Attempt at a Solution

i know the volume of a sphere is =4/3 (pi)r

^{3}

so can calculate the volume

i know the density of the balloon is

p=m/v

and that the buoyancy is going to be greater than the weight

i reaaranged the equation and substituted m=pv into f

_{b}=ma

to get f

_{b}=pva

but i dont think this is the right way to do it

where am i going wrong and how do i finish the equation?

cheers