A projectile is an object that is propelled through the air by a force, such as a bullet from a gun or a ball thrown by hand. It follows a ballistic trajectory and can cause damage upon impact.
When you throw a ball, it follows a curved path due to a combination of two forces: gravity pulling the ball downward and the initial forward velocity you give the ball. The force of gravity causes the ball to accelerate downward, while the initial forward velocity causes the ball to move horizontally. These two forces interact to create the ball's curved trajectory known as an arc.
Well it is a question of Projetile Motion. Whenever you project an object at some angle with horizontal it traces a curved path. Suppose 'x' be the angle with horizontal, 'm' be its mass, 'u' be its initial velocity. You might be knowing that any vector can be resolved into horizonal and vertical component. Here horizontal component of velocity will be ucosx and vertical will be usinx. At highest point the vertical component of the velocity will become zero. Hence it will have no velocity in vertically upward direction. It will only have velocity in horizontal direction which will be 'ucosx'.(The horizontal component of initial velocity will not affected by force of gravity and hence it will be constant throughout the motion.) So kinetic energy at highest point is: KE=0.5*m*(ucosx)^2 KE=0.5*50*(200*cos60)^2=25*10000=250000 J