Awavelength is moving at the rate of 40 cm/s. if the wavelength is 8 cm then what is the frequency of the wave?
a. 5 cm
b. 320 cm
c. 320 hz
d. 5 hz

We divide the speed of the wave by its wavelength to obtain how many waves will pass in a second, also known as the frequency.
40 / 8
= 5 waves/sec
= 5 Hz
The answer is D

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Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.