Protons and neutrons are composed
a.molecules
b.ions
c.quarks
d.electrons

Protons and neutrons are composed of quarks

C ( quarks)

Protons and neutrons consists of quarks.

Option C

Explanation:

The “elementary particle and fundamental constituent of matter” is known as quark. Quarks mix up to form “composite particles called hadrons”. The stable are protons and neutrons, which are the “components of atomic nuclei”.

Atoms consists of two particles electrons and quarks. Quarks are composed of protons and neutrons. There are three quarks in each proton and neutron. Many varieties of quarks available.  

Up quark and down quark are its types. There are “two up quark and one down quark” in the proton. There are “one up quark and two down quark” are there in the neutron.

hello your question lacks the required diagram attached below is the required diagram

answer : Both cars will move backwards and stop due to friction.

Explanation:

Given that both cars are negatively charged, When the wedges are removed both cars will move backwards ( repelling each other ) because they are like poles, and Like poles repel each other. while unlike poles attract each other ( forward movement )  .

The cars will later come to a stop due to frictional forces between the cars and the surface.