Acar starts from rest and travels for 5.8 s with a uniform acceleration of +1.2 m/s2. the driver then applies the brakes, causing a uniform acceleration of -1.7 m/s2. the breaks are applied for 1.60 s.
(a) how fast is the car going at the end of the braking period?
4.2 m/s
(b) how far has the car gone from its start?

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?