14-32 Kinetics of a Particle: Work and Energy | Chapter 14: Hibbeler Dynamics | Engineers Academy

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Chapter 14: Kinetics of a Particle : Work and Energy
Hibbeler Dynamics 14th ed

*14–32. The block has a mass of 0.8 kg and moves within the smooth vertical slot. If it starts from rest when the attached spring is in the unstretched position at A, determine the constant vertical force F which must be applied to the cord so that the block attains a speed vB = 2.5 m/s when it reaches B; sB = 0.15 m. Neglect the size and mass of the pulley. Hint: The work of F can be determined by finding the difference l in cord lengths AC and BC and using UF = F l.

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Why the force of spring is in a downward direction? Isn't the spring suppose to push the block upward?

zhongli