A0.2-kg steel ball is dropped straight down onto a hard, horizontal floor and bounces straight up. the ball's speed just before and just after impact with the floor is 10 m/s. determine the magnitude of the impulse delivered to the floor by the steel ball.

Explanation:

Given

mass of steel ball

initial speed of ball

Final speed of ball (in upward direction)

Impulse imparted is given by change in the momentum of object

therefore impulse J is given by

so magnitude of Impulse =4 N-s

f is prop to m1xm2 double m1 double force

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.