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A boat heads straight across at 4 m/s in a 3 m/s current. Its speed over the ground?
A7 m/s
B5 m/s
C1 m/s
D3.5 m/s
Answer & Solution
Correct answer: B. 5 m/s
The velocities are perpendicular, so speed is the square root of 16 + 9 = 5 m/s.
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