Beta particles cannot penetrate very far into solids because they: 1. have low velocity 2. have negligible mass 3. have no mass 4. have no mass are confined to orbits

the answer is b, have negligible mass

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )