ch07-p046 - 46. (a) Since constant speed implies K = 0, we...

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46. (a) Since constant speed implies Δ K 0, = we require WW ag =− , by Eq. 7-15. Since W g is the same in both cases (same weight and same path), then 2 9.0 10 a W J just as it was in the first case. (b) Since the speed of 1.0 m/s is constant, then 8.0 meters is traveled in 8.0 seconds. Using Eq. 7-42, and noting that average power is
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