ответ: 40 м
Объяснение:
( в условии ошибка и вместо слова "равноускоренного" ( в фразе : " ...начал торможение перед светофором и за 2 секунды равноускоренного прямолинейного движения... " ) в этом месте должно стоять слово "равнозамедленного" )
( докажите это самостоятельно )
Дано :
v1 = 72 км/ч = 20 м/с
v2 = 36 км/ч = 10 м/с
t = 2 c
s - ?
а = ( v2 - v1 )/t
a = ( 10 - 20 )/2 = -5 м/с²
s = ( v² - v1² )/( 2a )
Где v - конечная скорость автомобиля в конце пути ( поэтому v = 0 м/с )
s = v1²/( 2a )
s = - ( 20² )/( 2 * ( -5 ) ) = 40 м
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