# Question

A hot-air balloon ascends at a constant rate.

(a) The weight of the balloon does (1) positive work, (2) negative work, (3) no work. Why?

(b) A hot-air balloon with a mass of 500 kg ascends at a constant rate of 1.50 m/s for 20.0s. How much work is done by the upward buoyant force? (Neglect air resistance.)

(a) The weight of the balloon does (1) positive work, (2) negative work, (3) no work. Why?

(b) A hot-air balloon with a mass of 500 kg ascends at a constant rate of 1.50 m/s for 20.0s. How much work is done by the upward buoyant force? (Neglect air resistance.)

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