a proton travelling along is x-axis is slowed by a uniform electric field E. at x = 20.0 cm, the proton has a speed of 3.5x10^6 m/s and at 80.0 cm the speed is zero. Determine the magnitude and direction of e,

The electric field direction is toward the right

Explanation:

From the question we are told that

Initial X-co-ordinate of proton

Initial speed of Proton

Final X-co-ordinate of proton

Final speed of Proton

Generally the mass of Proton is given by

Generally the kinetic energy of the proton is mathematically given by

Generally the change in electric potential is mathematically given by

Charge on a proton

Generally the equation for magnitude of an electric field is mathematically given by

Where

Therefore

The direction of the charge is towards the right

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.