Help me please Which of the following has the most inertia?
A. A tennis ball going 4 m/s
B. A bowling ball at rest
C. A tenis ball at rest
D. A ping pong ball shot out of an air gun

 The smaller the inertia (mass) of an object, the less force is needed to accelerate it at a given rate. Since inertia is simply just a measurement of mass, the bowling ball has a higher mass, thus inertia, than the tennis ball.

Explanation:

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

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.