Any help would be greatly appreciated. I'm doing physics through correspondents, so I have nobody to explain this kind of thing to me. 1. The problem statement, all variables and given/known data The instruments attached to a weather balloon have a mass of 5.0kg. a) The balloon is released and exerts an upward force of 98 N on the instruments. What is the acceleration of the balloon and the instruments. b) After the balloon has accelerated for 10 seconds, the instruments are released. What is the acceleration of the balloon and the instruments? c) What net force acts on the instruments after their release? d) When does the direction of their velocity first become downward? 2. Relevant equations F=ma W=mg V=d/t A= (vf-vi)/t or A=F/m (I cannot think of any others needed...) 3. The attempt at a solution a) a=F/M a= 98N/5.0kg a= 19.6 m/s2 b)v=d/t v=0/0 v=0m/s2 This part confused me. Do I get the current velocity of the balloon, and that is the velocity of the instruments at the moment of their release? Or do I have to figure out how fast the balloon got after 10s of acceleration, then use that number for the velocity? c) W=mg W=(50kg)(9.80m/s2) W=490 N d) I'm not sure how to even attempt this part. How do I go about doing this part? Or do I only answer in a sentence?