physics
posted by Doris .
What is the average speed of a car that travels 210 m in 25 second, then speeds up to 0.47 km in 20 second and then slows down to 150 m in 0.50 minute?

v(ave) =total distance/ time taken =
=(210+470+150)/(25+20+30) = 11.7 m/s
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