Math Problem Statement

Vx is the velocity of a particle moving along the x-axis as shown. If x = 2.0 m at t = 1.0 s, what is the position of the particle at t = 6.0 s?

Solution

We are given the velocity VxV_x of a particle as a function of time, shown by the graph. The question asks us to find the position of the particle at t=6.0st = 6.0 \, \text{s}, knowing that the initial position x=2.0mx = 2.0 \, \text{m} at t=1.0st = 1.0 \, \text{s}.

To determine the position at t=6.0st = 6.0 \, \text{s}, we can integrate the velocity over time, as the position is the integral of velocity with respect to time:

  1. From t=1.0st = 1.0 \, \text{s} to t=3.0st = 3.0 \, \text{s}: The graph shows that the velocity decreases linearly from 4.0m/s4.0 \, \text{m/s} at t=1.0st = 1.0 \, \text{s} to 0m/s0 \, \text{m/s} at t=2.0st = 2.0 \, \text{s}, and then continues to decrease to 2.0m/s-2.0 \, \text{m/s} at t=3.0st = 3.0 \, \text{s}.

    The area under this part of the curve represents the displacement. The first part is a triangle from t=1.0st = 1.0 \, \text{s} to t=2.0st = 2.0 \, \text{s}, and the second part is a triangle from t=2.0st = 2.0 \, \text{s} to t=3.0st = 3.0 \, \text{s}.

  2. From t=3.0st = 3.0 \, \text{s} to t=6.0st = 6.0 \, \text{s}: The velocity is negative between t=3.0st = 3.0 \, \text{s} and t=5.0st = 5.0 \, \text{s}, reaching zero at t=5.0st = 5.0 \, \text{s}, and then turns positive between t=5.0st = 5.0 \, \text{s} and t=6.0st = 6.0 \, \text{s}.

Let's calculate the areas under the velocity-time graph to get the displacements for each interval.

I'll calculate the total displacement from t=1.0st = 1.0 \, \text{s} to t=6.0st = 6.0 \, \text{s}.The final position of the particle at t=6.0st = 6.0 \, \text{s} is 1.0m1.0 \, \text{m}. Therefore, the correct answer is:

c) +1.0 m

Would you like more details or have any other questions? Here are some related questions to consider:

  1. How does the area under a velocity-time graph relate to displacement?
  2. What is the significance of positive and negative areas under the velocity-time graph?
  3. How would the problem change if the velocity graph extended beyond t=6.0st = 6.0 \, \text{s}?
  4. What happens to the particle's motion between t=3.0st = 3.0 \, \text{s} and t=5.0st = 5.0 \, \text{s}?
  5. Can you derive velocity from a position-time graph in a similar way?

Tip: When dealing with velocity-time graphs, the area under the curve always represents displacement, with positive areas indicating forward motion and negative areas indicating backward motion.

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Math Problem Analysis

Mathematical Concepts

Kinematics
Velocity-Time Graphs
Integration of Velocity

Formulas

Displacement = ∫ Vx dt
Area under velocity-time graph = displacement

Theorems

Displacement as the integral of velocity over time

Suitable Grade Level

Grades 10-12