Hot air balloon a is rising upward a rate of 5.0 m/s. a passenger aboard balloon a observes balloon b rising upward at a relative rate of 7.5 m/s. what is the velocity of balloon b relative to the ground? assume that up is positive.

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.