If the motor exerts a force of F = (600 + 2s^2) N on the cable, determine the speed - F14-3

14.1 The Work of a Force
14.2 Principle of Work and Energy
14.3 Principle of Work and Energy for a System of Particles
F14-3. If the motor exerts a force of F = (600 + 2s^2) N on the cable, determine the speed of the 100-kg crate when it rises to s = 15 m. The crate is initially at rest on the ground.
All problems from Engineering Mechanics: Dynamics Fourteenth Edition in SI Units by R. C. Hibbeler.

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Why is the V of cable half that of motor,?