TIME, etc of a moving object without considering force acting on it are called equations of motion.These equations are only valid when the acceleration of the body is constant and they MOVE on a straight line.There are three equations of motion:V = u + atV2 = u2 + 2 a S\({\text{S}} = {\text{ut}} + \frac{1}{2}{\text{a}}{{\text{t}}^2}\)Where, V = final velocity, u = initial velocity,s = distance travelled by the body under motion,a = acceleration of body under motion,t = time taken by the body under motion.EXPLANATION:From the above explanation, we can see that,The second equation of motion gives the position-time relation,i.e. s = ut + (1/2) at2.Here, v is the final velocity, u is the initial velocity, a is the acceleration and t is the time.The FIRST equation of motion gives the relation between "velocity and time" i.e. v = u +at.The position-velocity relation gives the third equation of motion,i.e. 2as = v2 - u2.