If a train starts from rest and after 0.5 hours travels at a speed of 75 km/hr, what is its acceleration?

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

What is the coefficient of kinetic friction μk between the block and the tabletop?

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.