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Car A and car B are both travelling down a straight highway at 90 km/h. car A is only 6.0 meters behind car B. the driver of car B brakes , slowing down with a constant deceleration of 2.0 m//s^(2). After 1.2 seconds, the driver of car A begins to brake, also at 2.0 m//s^(2), but this is insufficient and the cars eventually collide, both still moving forward. what is the relative velocity of the two cars at the moment of the collision ?

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Answer Text

2.4 m/s5.0 m/s9.5 m/s21 m/s

Answer :
A
Solution :
<img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/BSL_XI_RT_P8_E01_316_S01.png" width="80%"> <br> `S_(rel)=u_(rel)t-1/2 are l t^(2)` <br> `=0-1/2 xx2xx1.2^(2) =-1.44 m` <br> `v_(rel)=u_(rel)-a_(rel)t=0-2xx1.2=-2.4 m//s`

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