The instruments attached to a weather balloon have a mass of 4.1 kg. The balloon is released and exerts an upward force of 99.9 N on the instruments.The acceleration of gravity is 9.8 m/s2 . a) What is the acceleration of the balloon and the instruments? b) After the balloon has accelerated for 10.2 s, the instruments are released. What is the velocity of the instruments at the moment of their release? c)Assume: The upward direction is positive. What net force acts on the instruments after their release in N? d) How long after their release does the direction of their velocity first become downward (negative) in s?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!