Solo 189
date:
w
a ballifs gently dropped from a height of rom. if its
velocity increases oniformly at the rate of 10m/s2, with
whor velocity wall pt strike the ground? after what time
will it strike the ground?

Note: Since I could not understand the height it was dropped from I will be using R. You can substitute whatever height in place of R.

Let the up be increasing y and down be decreasing y. We know the acceleration in the y direction which is,

I'm going to call it -g for simplicity.

Now integrating to get velocity,

Notice since the ball was dropped from rest, so the constant of integration is 0.

Integrating once more to get position,

<Since R is the initial height, it is the constant of integration here>

To answer the question for what time will it hit the ground, setting y=0 and solving for t we get:

Now to get the velocity at which it hit the ground, we plug in this value of t into our velocity equation:

Hope this helps!

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

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