5. A 0.08 kg soccer ball at rest is kicked and flies through the air with a speed of 40 m/s. What type of collision did the ball-foot system experience in the problems and how did the forces on each compare?
A. inelastic, same force on each
B. elastic, same force on each
C. inelastic, more force on foot
D. elastic, more force on ball

Aroller coaster car moving at a velocity of 30 meters/second has a momentum of 2.5 x 10^4 kilogram meters/second. what is its mass?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?