ch07-p040 - 40. (a) Using the work-kinetic energy theorem K...

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2.0 23 0 1 (2.5 ) 0 (2.5)(2.0) (2.0) 2.3 J. 3 fi KK x d x =+ = + = ³ (b) For a variable end-point, we have K f as a function of x , which could be differentiated to find the extremum value, but we recognize that this is equivalent to solving F = 0 for x : 2 0 2.5 0 Fx = ¡ −= . Thus, K is extremized at 2.5 1.6 m
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