BRAINLIEST! Please help me out with this!! :( Add two east west and two north south forces to the force diagram in order for the 2.0kg object to have a southward acceleration of 4.0 m/s/s

50.)the diagram below represents the wave fronts produced by a point source moving to the right in a uniformmedium. observers are located at points a and b.compared to the wave frequency and wavelength observed at point a, the wave observed at point b has a(1) higher frequency and a shorter wavelength(2) higher frequency and a longer wavelength(3) lower frequency and a shorter wavelength(4) lower frequency and a longer wavelength