Question

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?

Answer 1

we use standard formula for motion with cinstant acceleration
S=S₀+V₀t+at²/2
120=8t+3t²
solving this equation we obtain
t₁=5.13
t₂=-7.8
as along as it's time it can't be negative
thus answer is t=5.13s