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a truck covers 40m in 8.50s while slowing down to a final speed of 2.80m/s

2. Homework Equations

find original speed

find it's acceleration

3. The Attempt at a Solution

for original speed i think it is 40m/8.50s= 4.7m/s

now for acceleration i am not sure which kinematic equation to use. i think it's Vf=Vi+at am i on the right track or no