To begin with, we can use the formula that links frequency, wavelength and velocity.
Because you already have the wavelength and the frequency, you just need to solve for velocity. You can do this by multiplying each side of the equation by frequency.
Therefore, 400 x 2.5 = 1000m/s.
Hope this helps :)
I think the answer to this problem I believe would probably be B. learned optimism. I think it's the closest answer...I THINK
I dont know from option
Because SI Unit of acceleration is m/s^2