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Explain why when you throw a ball it travels in an arc and not in a perfectly straight line?
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.
A 50 kg cannon ball is shot horizontally from a cannon at a speed of 80 ms At this speed its kinetic energy will be joules?
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
