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PLEASE HELP
When you see a traffic light turn red, you apply the brakes and stop with constant acceleration.

If your initial speed was 23 m/s , what is your average speed during braking?
Express your answer to two significant figures and include the appropriate units.

PLEASE HELP When you see a traffic light turn red you apply the brakes and stop with constant acceleration If your initial speed was 23 ms what is your average class=

Respuesta :

Let the initial velocity be u = 23 m/s

Let the final velocity be v.

Vehicle stops finally, therefore v = 0 m/s

Here during the braking, vehicle decelerates with constant acceleration,  thus the change in velocity is linear from initial velocity to final velocity.

for the Given condition:

Write the expression for the average speed [tex]V_{avg}[/tex]

[tex]V_{avg} =  \frac{u+v}{2}\\[/tex]

Substitute the values in the above expression.

[tex]V_{avg} = \frac{23+0}{2}\\              = 11.5 m/s[/tex]

Hence, the average speed during braking is 11.5 m/s

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