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Answer on Mechanics | Relativity Question for jaz dom

Question #15712
a cart starts from rest and accelerates at 4.0 m/s for 5.o s and then decelerates at a rate of 2.0 m/s for 4.0s. what is the final speed of the car?
Expert's answer
The final speed of the car is

S = 4.0[m/s²]*5.0[s] - 2.0[m/s²]*4.0[s] = 12[m/s].

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