Двигаясь прямолинейно с постоянным ускорением 1, 5 м,с велосипедист уменьшил свою скорость от 15 м/с до 3 м/с. за какое время это произошло?
a=(v0-v1)t
t=(v1-v0)*a
t=|3-15|1,5=216с
Проверь по-моему так
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