How many neutrons does element x have if its atomic number is 26 and its mass number is 82?

The mass number is calculated by adding the number of protons and the number of neutrons.

Therefore, you can find the number of neutrons by subtracting the number of protons from the mass number. The number of protons is equal to the atomic number, therefore you just have to do the mass number - atomic number to find the number of neutrons.

82 - 26 = 56 neutrons.

the diagram which shows forces as either balanced = same speed or unbalanced = accelerarting

0.11 m/s and 0.28 m/s should be correct