Question 1198635
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In this problem, the power is the product of the constant force (4000 N) by the constant average speed  {{{50/5}}} = 10 m/s

    power = 4000 N * 10 m/s = 40000 {{{(N*m)/s}}} = 40000 W  (watts).    <U>ANSWER</U>
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Solved.