Jimmy held the end of a metal bar over a fire while holding on to the opposite end. after a few minutes, the end he was holding began to get very hot. which process is this convection or radition

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.