Current location - Health Preservation Learning Network - Slimming men and women - (20 14? Three identical objects, A, B and C, all have a mass m, which is placed on a smooth horizontal surface, and a light spring is compressed between B and C.
(20 14? Three identical objects, A, B and C, all have a mass m, which is placed on a smooth horizontal surface, and a light spring is compressed between B and C.
For AB as a whole, according to the law of conservation of mechanical energy:

2mgh= 12？ 2m？ v2

D: v=2gh

AB collision process, let the left side be the positive direction, according to the conservation of momentum:

mvB=2mv

Get: vB=2v

The separation process of BC and spring satisfies the conservation of momentum, that is, the total momentum of the system is zero:

Mvc=mvB

Get: vc=vB

According to the transformation and conservation of energy: EP =12mvb2+12mvc2 = 8mgh.

A: The initial elastic potential energy of a light spring is 8 mgh.

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