A rock of mass m= 1.3 kg is dropped from a height of h = 2.6 m into a
pool of water. At a time of t = 1.62 s after striking the surface of the water, the rock's velocity
has decreased by 50%.
What is the magnitude of the average force the rock experiences, in Newton’s, during the time t?

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