Can a body have velocity with non zero speed? if no, why? ?

The slope of a good speed time indicates ? a. velocity b. acceleration c. direction d. speed

In all trials, the magnitude of the final velocity for g1 + g2 was less than the magnitude of any initial velocity. as mass increased, what happened to the velocity? the velocity decreased. the velocity increased. the velocity of g1 + g2 could not be measured. the velocity was not affected by the mass increase.

An atom that has gained or lost electrons is called an _