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Mechanics, vertical motion.

Hello, I have a question on vertical motion.

A balloon of total mass 420kg is decending with a constant acceleration of 0.4 m/s². Find the upthrust acting on the balloon. When the balloon is moving at 1.5m/s, enough ballast is released for the balloon to fall with a deceleration of 0.2 m/s². Calculate

(a) how much ballast was released,
(b) the time for which the balloon continues to fall before it begins to rise.


Thanks for your time
From John
Reply 1
Neo1
Hello, I have a question on vertical motion.

A balloon of total mass 420kg is decending with a constant acceleration of 0.4 m/s². Find the upthrust acting on the balloon.


Here is first part.