Physics help in motion in 1-D?

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A car traveling at 'V' m/s is 'D' meters from a barrier when the driver slams on the breaks. the car hits the barrier T seconds later
a. show that the cars car's constant deceleration a, before impact is given by a a= 2(D - VT)/ T^2.
b. how fast was the car traveling at impact? (answers should be in terms of V, D, and T only)
 
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