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The instruments attached to a weather balloon have a mass of 5.1 kg.

(a) The balloon is released and exerts an upward force of 102 N on the instruments. What is the acceleration of the balloon and instruments?

(b) After the balloon has accelerated for 13 seconds, the instruments are released. What is the velocity of the instruments at the moment of the their release?

(c) What net force acts on the instruments after their release?

(d) When does the direction of their velocity first become downward?

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