A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation 1.8 m above ground level. The ball lands 18 m downrange. The player's pitching speed is ( g=10 m/s2 )

Question 4 options:

10 m/s

30 m/s

1 m/s

0.95 m/s

10.8 m/s

18 m/s

35 m/s

1. do the particles in the medium material move in the same direction of the wave or at opposite direction to the wave? explain your answer. 2. by inputting more energy into the wave, i.e a large shake of the spring, which wave property also increases? 3. are there forces of friction acting while a wave is passing through a medium?