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1,A block of mass 1.5 kg is attached to a horizontal spring that has a force constant of 1.20  103 N/m, and is free to slide on a frictionless surface as shown. The spring is compressed to  xi = −7.5 cm  by pushing on the block, and then the block is released. Find the work done by initially compressing the spring.  J Find the kinetic energy of the block when it reaches x = 0.  J Find the speed of the block at x = 0.  m/s

1,A block of mass 1.5 kg is attached to a horizontal spring that has a force constant of 1.20  103 N/m, and is free to slide on a frictionless surface as shown. The spring is compressed to  xi = −7.5 cm  by pushing on the block, and then the block is released. Find the work done by initially compressing the spring.  J Find the kinetic energy of the block when it reaches x = 0.  J Find the speed of the block at x = 0.  m/s

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1,A block of mass 1.5 kg is attached to a horizontal spring that has a force constant of 1.20  103 N/m, and is free to slide on a frictionless surface as shown. The spring is compressed to 

xi = −7.5 cm

 by pushing on the block, and then the block is released.

Find the work done by initially compressing the spring.
 J

Find the kinetic energy of the block when it reaches x = 0.
 J

Find the speed of the block at x = 0.
 m/s

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