Question

A hot air balloon is descending with a constant acceleration of \(2 \, \text{m/s}^2\). The mass of the balloon and its contents is 600 kg. Assuming the volume of the balloon is kept constant so that the buoyant force remains the same, the mass of the balloon should be changed so that it starts ascending with the same acceleration. (Take \(g = 10 \, \text{m/s}^2\)).

• A. 400 kg
• B. 200 kg
• C. 100 kg
• D. 500 kg

Hint:

In buoyancy problems, always remember: if volume is constant, buoyant force remains constant. Then use Newton’s second law separately for each motion condition.

Answer 1

The Correct Option is A