From what principal part does the present active infinitive come? this is for latin

Atrajectory has an initial velocity of 1,000 meters per second, and 5 seconds later, it has a velocity of 500 meters per second. which is the acceleration of the trajectory?

Atopic list should contain a. main topics covered in class c. important vocabulary words b. main ideas from the text book d. all of these

2. discuss some major differences between the satellites present with each planet.