Atoddler peddling a tricycle applies a net force of 150n to the pedals. we will assume that 100% of this force is transferred to foward motion. the grandmother of the toddler notice that the toddler on the tricycle is accelerating at a rate of 5m/s. what is the combined mass of the tricycle and toddler?

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.