Xf = vt + x0 Practice It is suspected that a person cheated in a 200 m dash race. His velocity was measured to be 15 m/s and he finished the race in 13 seconds. How far of a head-start did he have (normal starting position would be an initial position of 0 m).

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.