Block A in the figure below ha

Block A in the figure below has mass 1.30 kg , andblock B has mass 2.85 kg . The blocks are forced together,compressing a spring S between them; then the system isreleased from rest on a level, frictionless surface. The spring,which has negligible mass, is not fastened to either block anddrops to the surface after it has expanded. Block Bacquires a speed of 1.20 m/s .

Part A

What is the final speed of block A?

Part B

How much potential energy was stored in the compressedspring?


part A)

by linear momentum conservation

m1v1 =m2v2

1.3 v1 =2.85*1.2

v1 =2.63 m/s……speed of block A

Part B)

potential energy was stored in the compressed spring =1/2m1v12 +1/2 m2v22

                                                                           =0.5*1.3*(2.63)2 +0.5*2.85*(1.2)2


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