A block weighing 200 N is pushed along a surface. If it takes 80 N to get the block moving, what are the coefficients of friction?

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

Which of these questions might a character ask if the conflict is man versus self? a. which path should i take to better myself? b. which boulder will be too heavy for me to carry? c. which friend is going to ditch me today? d. all of the above