In order for an object to speed up, must be in the same direction. 1) speed and velocity
2) displacement and velocity
3) velocity and acceleration
4) speed and acceleration
5) displacement and acceleration

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.