HELP ME PLS Coal is a fossil fuel that is used to produce electricity. Which of these statements best describes a benefit of coal mining on the region around the mines?

It gets abundant electricity.
It becomes rich in minerals.
Its groundwater is less contaminated.
The rate of evaporation decreases for local rivers.

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Avector of magnitude 2 cannot be added to a vector of magnitude 3 so that the magnitude of the resultant is a. zero b. 1 c. 3 d. 5 e. 7