1. The problem statement, all variables and given/known data A hot air balloon of mass 425 kg ascends from the ground level and accelerates at a rate of 1.25 m/s/s for 25 seconds. How much work is done by the upward buoyant force on the balloon? (conceptual) A certain amount of work W is required to accelerate a car from rest to a speed of v. How much work is required to accelerate from rest to a speed of v/2? 2. Relevant equations W=fd Fnet=ma KE=1/2mv^2 3. The attempt at a solution I tried to find Fnet first, so would it be the upward buoyant force (what is trying to be solved)+mg (weight)= 425x1.25. Then find the displacement using one dimensional motion, getting 390.625 m traveled. Is all this right? How do I proceed? Rearranged W=1/2m(v/2)^2 to 4w=1/2mv^2. How do I proceed? I'm solving for work required.