1. Average speed = Total distance travelled / total time taken

2. Average velocity = Displacement / time interval

3. Acceleration, a = Change in velocity /time taken

Equations of linear motion-

1. v= u+at

2. S = ut+1/2 at²

3. v² =u²+2aS             

4. S = (u+v/2)t

5. D_n = u+a/2 (2n-1)

Here, S is distance , D_n is the distance travelled in n^th second.

When a body falls from a height h , under gravity-

Initial velocity, u= 0, acceleration = +g and S= h

1. v = gt

2. h= 1/2 gt²

3. v² =2gh

4. D_n = g/2(2n-1)

6. Time of descent, t_D = v/g = √(2h/g)