write the equations of motion if an object is thrown in vertically upward direction.

An object that is thrown vertically upwards decelerates under the earth's gravity. Its speed decreases until it attains a maximum height, where the velocity is zero. Then it is accelerated uniformly downwards under gravity. When it returns to the point of projection it has the same speed as that at the instant of projection. In addition, the duration of the upward motion is exactly equal to that of the downward motion. The equation of motion are