Aweather balloon, rising vertically at 25.0 m/s, releases an instrument package when it is 100. meters above the ground. how many seconds does it take from when the package was released for the package to hit the ground?

7.74 seconds

Explanation:

u = 25 m/s

h = - 100 m

Let it takes time t to hit the ground.

Use second equation of motion

Take positive sign as time can never be negative.

t = 7.74 s

Thus, the package takes 7.74 seconds to reach the ground.

the diagram which shows forces as either balanced = same speed or unbalanced = accelerarting

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it