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A 20 kg block on a horizontal surface is attached to a horizontalspring of spring constant k  4.0 kN/m. The block is pulledto the right so that the spring is stretched 10 cm beyond its relaxedlength, and the block is then released from rest.The frictional forcebetween the sliding block and the surface has a magnitude of 80 N.(a) What is the kinetic energy of the block when it has moved 2.0cm from its point of release? (b) What is the kinetic energy of theblock when it first slides back through the point at which the springis relaxed? (c) What is the maximum kinetic energy attained by theblock as it slides from its point of release to the point at which thespring is relaxed?


A 20 kg block on a horizontal surface is attached to a horizontalspring of spring constant k  4.0 kN/m. The block is pulledto the right so that the spring is stretched 10 cm beyond its relaxedlength, and the block is then released from rest.The frictional forcebetween the sliding block and the surface has a magnitude of 80 N.(a) What is the kinetic energy of the block when it has moved 2.0cm from its point of release? (b) What is the kinetic energy of theblock when it first slides back through the point at which the springis relaxed? (c) What is the maximum kinetic energy attained by theblock as it slides from its point of release to the point at which thespring is relaxed?


Grade:11

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