# Answer on Mechanics | Relativity Question for Theresa

Question #4566

If a car ca accelerate at 4.3m/s

^{2}, how far will it have to travel from rest to reach a speed of 28 m/s?Expert's answer

a=4.3 m/s

V=28 m/s

S-?

S=S

V=V

S

V=at => t=V/a

S=a/2*V

^{2}V=28 m/s

S-?

S=S

_{0}+V_{0}t+at^{2}/2V=V

_{0}+atS

_{0}=0, V_{0}=0 => S=at^{2}/2V=at => t=V/a

S=a/2*V

^{2}/a^{2}=V^{2}/2a^{}S=28^{2}/2/4.3=91,16m^{}Need a fast expert's response?

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