Four forces are being applied to move an object to the left. force 1 is pushing to the right at 200 n. force 2 is pushing to the left at 500 n. force 3 is pushing to the right at 100 n. force 4 is pushing to the left at 50 n. what's the net force acting on this object?
a. −250 n
b. 850 n
c. 0 n
d. 250 n

The correct option is A.

Explanation:

Force 1 is pushing to the right at 200 N.

Force 2 is pushing to the left at 500 N.

(negative sign indicates the direction of the force )

Force 3 is pushing to the right at 100 N

Force 4 is pushing to the left at 50 N

(negative sign indicates the direction of the force )

Net force on the object:

-250 N the net force acting on this object.

i would say b

explanation:

but i think i would need more information than that

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.