physics 1
posted by rrrr
You are driving your car, and the traffic light ahead turns red. You apply the brakes for 2.13 s, and the velocity of the car decreases to +4.90 m/s. The car's deceleration has a magnitude of 3.55 m/s2 during this time. What is the car's displacement?

Steve
if the initial velocity was v,
v  3.55*2.13 = 4.90
v = 12.46 m/s
the displacement s is thus
s = 12.46*2.13  3.55/2 * 2.13^2
s = 18.49 m
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