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Question:

What kind of sport do sleds do at the beginning?

(1) what kind of sport do sleds do at the beginning?(2) when the speed of the sled is 5m / S, how much acceleration is it?(3) the aerodynamic drag coefficient K of the air and the dynamic friction factor between the sled and the inclined snow surface.

Answer:

When the speed of the sled is 5m / S, the acceleration of the sled is equal to the slope of the AB line, that is, the speed of the sledA = 2.5m / S 2 (4 points)(3) when the speed of the sled is 5m / S, it is obtained by the law of motionMgSin theta mgCos kV = ma = 3When the sled moves at constant speed, the speed is V M = 10m / SMgSin mgCos KV theta theta = m (3 points)Simultaneous solution of k = 37.5, Mu = 0.125 (2 points) two
Starting from the title that the sled acceleration acceleration decreases gradually, and finally a uniform linear motion. (3 points)
(1) acceleration with decreasing acceleration, and finally moving in uniform linear motion (2) 2.5m / S 2 (3) 0.125

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