Acyclist accelerates from 0 m/s [s] to be 15 m/s [s] in 4 s. what is his acceleration?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?