The force of causes a falling object to accelerate at 9.8 m/s/s. Question 3 options: tension gravity mass velocity

gravity

Explanation:

Gravity is the reason why objects fall in the first place, while mass is how much matter there is in an object and the velocity is the rate of change when moving the object.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.