In tennis, one of the primary ways to win a point is by making the ball bounce twice on your opponent's side of
the court. A tennis player hits a ball at a velocity of 50
m/s at a 0 degree angle from 1m high. When the ball
bounces it reflects its velocity angle perfectly and loses
30% of its speed.

How long does the other player have to return the ball
before the second bounce?

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)