# Answer on Mechanics | Relativity Question for Brittany

Question #5199

A car drives with a constant acceleration of 6.0 m/s2. If it begins with a velocity of 8.0 m/s, and travels a displacement of 120 m, how much time will this elapse?

Expert's answer

we use standard formula for motion with cinstant acceleration

S=S

120=8t+3t

solving this equation we obtain

t

t

as along as it's time it can't be negative

thus answer is t=5.13s

S=S

_{0}+V_{0}t+at^{2}/2120=8t+3t

^{2}solving this equation we obtain

t

_{1}=5.13t

_{2}=-7.8as along as it's time it can't be negative

thus answer is t=5.13s

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