I believe the answer is A
Answer:
D) 1000 m/s
Explanation:

You have the wavelength and frequency, you just need to solve for velocity. You can do this by multiplying each side of the equation by frequency.
Hope this helps.
The right answer for the question that is being asked and shown above is that: "A. Machines increase the amount of force required to do a task. " The statement that is true about machines is that <span>A. Machines increase the amount of force required to do a task. </span>