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The original speed of a car is 30 km / h, now it starts to accelerate evenly, increasing by 204 km / h; a car? A The original driving speed of a car is 30 km / h, and now it starts to accelerate evenly, increasing the speed by 204 km / h per hour; the original driving speed of a car is 90 km / h, and now it starts to decelerate evenly, decelerating by 10 km / h per hour. After how long, the speed of the cars is the same? What is the speed at this time?
Suppose that after t hours, the speed of the two cars is equal
From v = V0 + a △ T, we can get that:
v1+a1△t1=v2+a2△t2
30+204t=90-10t
T = 0.2804 hours
v= v0+a△t
=90+（-10）×0.2804
=87.20 km / h
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