1.Was the mechanical energy of the falling mass conserved?Di

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/08/24 11:08:18

1.Was the mechanical energy of the falling mass conserved?Discuss the possible sources of error.
2.When a ball at rest is dropped,can it rebound to a greater height than its original height?
3.A 2 kg rock is released from rest at a height of 29 m.Ignore air resistance and determine the kinetic energy,gravitational potential energy,and total mechanical energy at each of the following heights:20m; 15m; 5m; 9m.
4.A man runs with a speed of 6 m/s off a platform that is 10 m above the water.How fast if he moving when he hits the water?Ignore air resistance.
朋友,可以用英文答吗?

1.If the retarded force can be negligible,mechanical energy of the falling mass conserved.The error source comes from resistance,buoyancy and other similar things.
2.The ball can't rebound to a greater height than its original height because of resistance.If the retarded force can be negligible,the ball only can rebound to its original height.

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