If a blue filter is placed in between the yellow filter and the white screen, predict the light colour that might be observed on the white screen. Explain your answer.

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?