In a football game, running back is at the 10 yard line and running up the field towards the 50 yard line, and runs for 3 seconds at 8yd/s. what is his current position（in yards）?

Arock collection comes from which part of earth?

Which of the following is the result of the nuclear weak force? the instability of large nuclei the repelling force between positively charged protons the structure of the atom certain types of nuclear decay

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity