In a 100 m dash event, the sprinter siva clears 18m-in 2 seconds, uniformly in creasing speed.State whether the motion is dimensional or two dimensional.

In a 100 m dash event, the sprinter siva clears 18m-in 2 seconds, uniformly in creasing speed.Obtain the formula for displacement after a time 't' second.

A ball of mass m is projected at an angle with the ground and it is found that its kinetic energy at the highest point is 75% of that at the point of projection. a)Is it a one dimensional or a two dimensional motion?Why? b)Find the angle of projection. c)Determine another angle of projection which produces the same range.