A75 kg football player is gliding forward across very smooth ice at 4.6 m/s. he throws a 0.47 kg football straight forward. a) what is the player's speed afterward if the ball is thrown at 15 m/s relative to the ground? b) what is the player's speed afterward if the ball is thrown at 15 m/s relative to the player?

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