3 answers
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Divide the speed change by the acceleration rate.
15/2.1 = ___ s
15/2.1 = ___ s
v = u + at
Where:
v = Final velocity = 2.0 m/s
u = Initial velocity = 17 m/s
a = Acceleration = -2.1 m/s^2 (negative because the car is slowing down)
t = Time
Rearranging the equation, we get:
t = (v - u) / a
Substituting the given values, we have:
t = (2.0 m/s - 17 m/s) / (-2.1 m/s^2)
Calculating the expression, we get:
t = (-15 m/s) / (-2.1 m/s^2)
The units "m/s" in the numerator and denominator cancel out, leaving us with:
t = 15 / 2.1
Using a calculator, we can simplify the expression:
t ≈ 7.14 seconds
Therefore, it takes approximately 7.14 seconds for the car to reach a speed of 2.0 m/s.