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Unformatted text preview: final speed of the boat? Applying the Energy Principle: Δ E sys = Δ KE = 1 2 M ( v f 2 − v i 2 ) = F net i Δ r = − 1000 J Solving for the final speed, v f = 1.01 ⋅ m / s (d) Without doing any geometrical calculations, say what is the angle between the (vector) force that Jill exerts and the (vector) velocity of the boat. Explain briefly how you know this. The (vector) velocity of the boat is along the displacement ( Δ r ) direction. We have already found that Jill did no work in moving the boat from its initial position to its final position, yet she did exert a force. Therefore, the force Jill exerted is perpendicular to the boat’s velocity. (e) What effect does Jill have on the boat’s motion? While Jill does no work on the boat, she has changed its direction of motion....
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 Fall '08
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 Energy, Force, Potential Energy, Work, Jill

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