SOLUTION: YOU ARE IN A SPEED BOAT ON A RIVER MOVING IN THE SAME DIRECTION AS THE CURRENT. THE SPEEDOMETER ON THE BOAT SHOWS THAT ITS SPEED IS 20 KM/H. HOWEVER, A PERSON ON THE SHORE MEASURES
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Question 540278: YOU ARE IN A SPEED BOAT ON A RIVER MOVING IN THE SAME DIRECTION AS THE CURRENT. THE SPEEDOMETER ON THE BOAT SHOWS THAT ITS SPEED IS 20 KM/H. HOWEVER, A PERSON ON THE SHORE MEASURES THE BOAT'S SPEED AS 23 KM/H. HOW IS THIS POSSIBLE?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
YOU ARE IN A SPEED BOAT ON A RIVER MOVING IN THE SAME DIRECTION AS THE CURRENT. THE SPEEDOMETER ON THE BOAT SHOWS THAT ITS SPEED IS 20 KM/H. HOWEVER, A PERSON ON THE SHORE MEASURES THE BOAT'S SPEED AS 23 KM/H. HOW IS THIS POSSIBLE?
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The speedometer does not measure the speed of the current; it
measures the speed of the boat thru the water.
actual speed - current speed = 20 km/hr
The observer sees that combined speed of the boat and the current.
actual speed + current = 23 km/hr
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Speed of the current is 3 km/hr
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Cheers,
Stan H.
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