Physics, 14.01.2021 14:00 llamaSmartz

What is the doppler effect in astronomy used for?

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Physics, 23.06.2019 11:00, luckylady

Olympic skier tina maze skis down a steep slope that descends at an angle of 30∘ below the horizontal. the coefficient of sliding friction between her skis and the snow is 0.10. i found maze's acceleration which is 4.1 m/s^2. but how do you determine maze's speed 4.0 s after starting?