Could you answer these questions with a small explanation as to why that is the answer?

Question

Two helium nuclei have the same speed, mass and charge. They are moving diretly towards eachother.

Which statement is correct?
A The nuyclei attract one another with a net gain in their energy
B The nuclei repel one another with a net loss in their energy
C The nuclei attract one another and their total energy stays constant
D The nuclei repel one another and their total energy stays constant

What happens when two nuclei of deuterium (2/1 H) fuse together to form a nucleus of helium (4/2 He)?
A Energy and mass are both lost
B Energy is converted into mass
C Mass and energy are both lost
D Mass is converted in energy

Answer 1

For the first question, the answer is D.

Nuclei are always positively-charged. Always always always always. At any rate, when two objects with an identical charge approach are near each other, they repel each other. The same way magnets repel each other when you try to force the poles together.

With regards to question 2, think about how our sun works.

Answer 2

You're doing a take home test, aren't you?

Answer 3

1.none
2.none

Answer 4

1. A
2. B