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How does the speed of a current down a river affect the speed of a boat across a river?

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User Grub
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Answer:

The river current influences the motion of the boat and carries it downstream. The motorboat may be moving with a velocity of 4 m/s directly across the river, yet the resultant velocity of the boat will be greater than 4 m/s and at an angle in the downstream direction.

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User Kenchilada
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