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A hot-air balloon has a total mass of 740kg. It accelerates downwards (towards the ground) at 1.9m/s2 even though an upwards lift force in acting

A hot-air balloon has a total mass of 740kg. It accelerates downwards (towards the ground) at 1.9m/s2 even though an upwards lift force in acting on it. a) Find the lift force acting on the balloon: b) What must be the total mass that needs to be thrown overboard if the operator on the hot-air balloon decides to accelerate upwards at 3.7m/s2? Assume the upwards lift force remains the same.

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