Math Problem Statement

  1. A car begins at rest at a stoplight. After the light turn green, the car begins to accelerate 5 m/s2 over the span of 3.6 seconds. What is the car’s displacement over this period of time?

Solution

To solve this problem, we can use one of the kinematic equations for motion under constant acceleration:

s=v0t+12at2s = v_0 t + \frac{1}{2} a t^2

where:

  • ss is the displacement (what we're solving for),
  • v0v_0 is the initial velocity (0 m/s, since the car starts from rest),
  • aa is the acceleration (5 m/s2^2),
  • tt is the time (3.6 seconds).

Since v0=0v_0 = 0, the equation simplifies to:

s=12at2s = \frac{1}{2} a t^2

Now, substitute the given values into the equation:

s=12×5m/s2×(3.6s)2s = \frac{1}{2} \times 5 \, \text{m/s}^2 \times (3.6 \, \text{s})^2

s=12×5×12.96=2.5×12.96=32.4ms = \frac{1}{2} \times 5 \times 12.96 = 2.5 \times 12.96 = 32.4 \, \text{m}

So, the car's displacement over the period of 3.6 seconds is 32.4 meters.

Would you like more details on the steps involved, or do you have any questions?

Here are 5 related questions:

  1. What would be the final velocity of the car at the end of the 3.6 seconds?
  2. How much time would it take for the car to reach a displacement of 100 meters under the same acceleration?
  3. If the car maintained the final velocity from the acceleration phase, how far would it travel in the next 5 seconds?
  4. How would the displacement change if the acceleration were halved?
  5. What is the car's average velocity during the acceleration phase?

Tip: In problems involving acceleration from rest, the displacement is directly proportional to the square of the time.

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Math Problem Analysis

Mathematical Concepts

Kinematics
Motion Under Constant Acceleration

Formulas

s = v₀t + ½at² (displacement equation for constant acceleration)

Theorems

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Suitable Grade Level

Grades 9-11