Points on a Number Axis

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Questions and Answers

Points A and B on a number line represent real numbers $m$ and $n$, respectively. If the distance between A and B is given by $|m - n| = 5$, and both points start moving simultaneously in the same direction with different velocities, which expression represents the distance between the two points after $t$ seconds if A's velocity is $v_A$ and B's velocity is $v_B$?

  • $|5 + (v_A - v_B)t|$ (correct)
  • $5 + (v_A - v_B)t$
  • $|5| + |(v_A - v_B)t$|
  • $5 + |v_A - v_B|t$

Given that points A and B are on a number line with coordinates $m$ and $n$ respectively, such that $|m - n| = 5$. If both points move in the same direction, and point A moves faster than point B, what can be said about the distance between A and B as time $t$ increases?

  • The distance between A and B will decrease and then increase.
  • The distance between A and B will approach zero.
  • The distance between A and B will increase linearly with time. (correct)
  • The distance between A and B will remain constant at 5.

Points A and B are located on a number line at coordinates $m$ and $n$, respectively. The distance between them is $|m - n| = 5$. If both points begin moving simultaneously at time $t = 0$ in the same direction, and after some time $t$ the distance between them is 12, which equation could model this scenario, assuming $v_A$ and $v_B$ are the velocities of A and B respectively?

  • $5 + (v_A - v_B)t = 12$, where $v_A < v_B$
  • $5 - (v_A - v_B)t = 12$, where $v_A > v_B$
  • $|5 + (v_A - v_B)t| = 12$ (correct)
  • $|5 - (v_A - v_B)t| = 12$

Suppose points A and B on a number line have coordinates $m$ and $n$ respectively, with $|m - n| = 5$. They move in the same direction with different speeds. If after time $t$, the distance between them is the same as the initial distance, what can we infer about their velocities?

<p>The velocities of A and B are equal. (D)</p> Signup and view all the answers

Points A and B are on a number line at coordinates $m$ and $n$ with $|m - n| = 5$. If A and B start moving towards the same direction such that their distance remains constant, and the velocity of A doubles, what happens to the velocity of B?

<p>The velocity of B also doubles. (A)</p> Signup and view all the answers

Given two points, A and B, on a number line with an initial separation of 5 units. If they move in the same direction with velocities $v_A$ and $v_B$ respectively, and $v_A > v_B$, what does the expression $(v_A - v_B)t$ represent?

<p>The relative displacement between A and B after time $t$. (D)</p> Signup and view all the answers

Points A and B, initially 5 units apart on a number line, start moving simultaneously in the same direction. If the distance between them increases at a rate of 2 units per second, which of the following equations correctly describes the distance $D$ between them at time $t$?

<p>$D = 5 + 2t$ (C)</p> Signup and view all the answers

Consider two points, A and B, on a number line initially separated by a distance of 5 units. Both points move in the same direction. If after $t$ seconds, the distance between them is given by $|5 + (v_A - v_B)t|$, what condition must be true if the distance between them remains constant at 5 units?

<p>$v_A$ must equal $v_B$ (A)</p> Signup and view all the answers

If points A and B on a number line are initially 5 units apart and start moving in the same direction, how would you determine the time $t$ at which their distance doubles, given their velocities $v_A$ and $v_B$?

<p>Solve $|5 + (v_A - v_B)t| = 10$ (A)</p> Signup and view all the answers

Points A and B are on a number line, 5 units apart. They move in the same direction. Which scenario would result in the distance between points A and B decreasing over time?

<p>A is moving slower than B, and A is initially ahead of B. (D)</p> Signup and view all the answers

Flashcards

Distance Between Points A and B

The distance between points A and B on a number line is given by the absolute difference of their coordinates: AB = |m - n| = 5. Both points start moving at different speeds in the same direction.

Distance After t Seconds

To find the distance between points A and B after t seconds, you need to know their speeds (v_A and v_B). The distance will be the initial distance (5) plus the difference in the distances they've traveled.|5 + (v_A - v_B)t|

Study Notes

  • Points A and B are on a number axis, representing real numbers m and n.
  • The distance AB = |m - n| = 5.
  • A and B start moving simultaneously at different speeds in the same direction.
  • Find the distance between the two points A and B after t seconds.

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