Consider a plane with negligible friction (i.e. treatable as if it were smooth) inclined at an angle with respect to the horizontal. Let A be the bottom of the inclined plane, i.e. the point where it meets the horizontal support surface, and set its height to zero ( ). A mass body is thrown upwards along the plane, starting from point A.Il body rises until it reaches point B, at altitude, before stopping and falling back. How much is the modulus of the initial velocity of the body?