Question

53. The total weight of gas filled balloon is 4200N. The balloon rises at a
constant speed of 10m/s. The resultant force on the balloon is
(1 Point)
zero
4200N
2100N
1400N​

Answer 1

Explanation:

The resultant force on the balloon is zero becaue its acceleration is zero.

F=ma and a =0 so F=0 but this F is the net external force acting on the balloon.

However, the resultant force (the net force) is the resulktant of at least three forces: the weight of the balloon, the upthrust (buoyancy) and the drag force/air resistance as the balloon is rising at 10m/s