Acart is rolling across the floor at a constant velocity of 2 m/s to the right. the cart is pushed again to the right, and it starts to speed up. how are the force of the push and speed of the cart related? a. the force of gravity makes the cart speed up. b. the force and speed are not related. c. the unbalanced push causes the cart to speed up. d. the balanced push causes the cart to speed up.

the answer is c.The unbalanced push causes the cart to speed up.

Explanation:

The application of an unbalanced force (the push) causes the cart to speed up. When the cart is in constant motion, the forces are balanced and there is no speeding up. Once an unbalanced force is added, the cart's speed changes.

          The unbalanced push causes the cart to speed up.

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.