A boat moving with a velocity of 20ms-1 in a sea, is rocked by waves. If the crests of waves are 80m apart, after how much time the boat will bounce up?
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Answer:
4 seconds.
Explanation:
The distance between successive crests gives the wavelength of the wave.
Given we have the wavelength and the speed of the boat we can get the time taken for the boat to bounce up.
For the boat to bounce up it has to move through the wavelength of the waves.
Therefore we have :
Distance = 80 meters
Speed = 20 m/s
Given distance and speed :
Time = Distance / speed
Time = 80/20 = 4 seconds.
Therefore it takes the boat 4 seconds to bounce up.
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