ch08-p070 - 70. (a) To stretch the spring an external...

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70. (a) To stretch the spring an external force, equal in magnitude to the force of the spring but opposite to its direction, is applied. Since a spring stretched in the positive x direction exerts a force in the negative x direction, the applied force must be 2 52.8 38.4 Fx x =+ , in the + x direction. The work it does is 1.00 1.00 22 3 0.50 0.50 52.8 38.4 (52.8 38.4 ) 31.0J. 23 Wx x d x x x §· = + = ¨¸ ©¹ ³ (b) The spring does 31.0 J of work and this must be the increase in the kinetic energy of
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