CBSE Class 11-science Answered
The driver of a blue car moving at a speed of 80km/hr suddenly realises that she is about to rear-end a red car moving at a speed of 60 km/hr. To avoid a collision what is the maximum speed the blue car can have just as it reaches the red car?
Asked by irena_rio | 27 Sep, 2011, 12:00: AM
Expert Answer
peed of the car moving ahead = 60 km/hr
Speed of the car moving behind = 80 km/hr
Let the speed required of the car moving behind at the time it reaches the car moving ahead be x km/hr
Now the relative velocity of the car moving behind wrt the car moving ahead shud not be positive.
hence ..
x - 60 <= 0
x <= 60
as the question asks for the maximum value of x ..
hence ..answer is 60 km/hr.
Answered by | 30 Sep, 2011, 12:30: PM
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