I solid iron ball of mass 770kg is used on a building site. The ball is suspended by a rope from a crane. The distance from the point of suspension to the centre of the mass of the ball is 12 m.The ball is pulled back from the vertical and then realeased, it falls through a vertical height of 1.6m and strikes the wall: What is the speed of the ball just before impact?

Question

anonymous · Answer

|dw:1363758052064:dw|
simplest way..-> use conservation of energy ---> PE becomes KE

long way.. use forces, circular motion and find the acceleration, etc..