2. A car is traveling a road that includes two sides of a rectangle with the
sides a and b with a constant speed. What is the speed if the
magnitude of the average velocity of the car is v?

Respuesta :

The speed of the car in terms of the average velocity is [tex]\frac{v(a+ b) }{\sqrt{a^2 + b^2} }[/tex]

The given parameters;

  • length of each side of the triangle = a and b
  • average velocity = v

The average velocity of the car is defined as the rate of change of displacement.

[tex]average \ velocity = \frac{displacement}{time}[/tex]

The displacement of the car along the rectangle is obtained by applying Pythagoras theorem to calculate the diagonal of the rectangle ;

c² = a² + b²

[tex]c = \sqrt{a^2 + b^2}[/tex]

[tex]v= \frac{\sqrt{a^2 + b^2} }{t} \\\\t = \frac{\sqrt{a^2 + b^2} }{v}[/tex]

The speed of the car is defined as the rate of change of distance.

[tex]speed = \frac{distance}{time}[/tex]

The distance around the 2 sides of the rectangle is calculated as;

Distance =  a + b

[tex]speed = \frac{a+b}{t}[/tex]

[tex]speed = \frac{v(a+ b)}{\sqrt{a^2 + b^2} }[/tex]

Thus, the speed of the car is [tex]\frac{v(a+ b) }{\sqrt{a^2 + b^2} }[/tex]

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