To set a speed record in a measured (straight-line) distance d , a race car must

Question

To set a speed record in a measured (straight-line) distanced, a race car must be driven first in one direction (intime t1) and then in the opposite direction (intime t2). (a) To eliminate theeffects of the wind and obtain the car's speedvc in a windless situation, what number ofmethod should we use: the average ofd/t1 andd/t2 (method 1) or should we divided by the average of t1 andt2 (method 2)? (b) What is thefractional difference in the two methods when a steady wind blowsalong the car's route and the ratio of the wind speedvw to the car's speed vc is0.0540?

Explanation / Answer

1)method 1. calculate v1 and v2, then the average of v1 and v2. 2)The wind velocity will be added or subtract from the carvelocity. t1/t2=v2/v1=(1+0,034)/(1-0,034)=1,07

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