2 cars are initially 36m apart travelling..?

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chris

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2 cars are initially 36m apart travelling in the same direction along a straight horizontal road. The car in front is initially travelling at 10ms^-1 but decelerating at 2ms^-2. The other car travels at a constant 15ms^-1

a)Model the cars as particles. By finding the distance travelled by each car after t seconds, show that the distance between the 2 cars is 36-5t-t^2 metres. Find when they would collide if neither car takes avoiding action

b) Would it be necessary to revise your answers to part a) if the cars were not modelled as particles? give reasons to support your answer

Please tell me how to do this i have no clue

Thanks in advance
 
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