There is a sandbag dropped from a balloon. At the moment the sandbag is dropped, the balloon is moving upwards at 10 m/s. Why would some people believe that the motion of the sandbag is straight downward with the initial speed 0 m/s, and other think that the motion of the balloon goes up after it is dropped with an initial speed 10 m/s. Give as many reasons as possible for each point. I know that the balloon would go up with an initial speed of 10m/s that is the balloon speed and then would falls down, but what reasons should I give more then the sandbag is following the balloon's speed?