4. A 15kg box slides down a bumpy track as shown, starting from rest at a point 12.7m above the ground. a) If there is no friction, how fast is the box moving at the bottom? 12.7m b) If friction does -200J of work on the box as it slides, how fast is the box moving at the bottom?

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Chapter1: Units, Trigonometry. And Vectors
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4. A 15kg box slides down a bumpy track as shown,
starting from rest at a point 12.7m above the
ground.
a) If there is no friction, how fast is the box
moving at the bottom?
12.7m
b) If friction does-200J of work on the box as it slides, how fast is the box moving
at the bottom?
Transcribed Image Text:4. A 15kg box slides down a bumpy track as shown, starting from rest at a point 12.7m above the ground. a) If there is no friction, how fast is the box moving at the bottom? 12.7m b) If friction does-200J of work on the box as it slides, how fast is the box moving at the bottom?
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