# Physics

posted by Jules

The instruments attached to a weather balloon have a mass of 5.2 kg. The balloon is released and exerts an upward force of 98 n on the instruments.
A)what is the acceleration of the balloon and instruments?
B) after the balloon has accelerated for 10s, the instruments are released. What is. The velocity of the instruments at the moment of their release?
C) when does the direction of their velocity first become downward?

1. drwls

A) Note that the weight W = 51N also acts on the instruments
a = [F(instr)-W]/M(instrmnt)
= (98- 51)/5.2 = 9.03 m/s^2
B) V = a*t , with t = 10 s
C) when g*t' = V of part B
Solve for t' (measured from release)

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