A 0.500-{\rm kg} block, attached to a spring with length 0.60{\rm m} and force constant 40.0 {\rm{ N/m}}, is at rest with the back of the block at pointAon a frictionless, horizontal air table (the figure View Figure ). The mass of the spring isnegligible. You move the block to the right along the surface bypulling with a constant 20.0-{\rm N} horizontal force.
A : What is the block's speed when the back of the blockreaches point B,which is 0.25 {\rm m} to the right of point A?
B : When the back of the block reaches point B, you let go of the block. In the subsequent motion,how close does the block get to the wall where the left end of thespring is attached?
can any one show me how i can solve this problem please


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