vadiliants1024 vadiliants1024
  • 24-09-2020
  • Physics
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A car accelerates from rest at 7.2 m/s 2 . How much time does it need to attain a speed of 4 m/s? Answer in units of s.

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CarliReifsteck CarliReifsteck
  • 25-09-2020

Answer:

The time is 0.6 sec.

Explanation:

Given that,

Acceleration of car = 7.2 m/s²

Speed = 4 m/s

We need to calculate the time

Using equation of motion

[tex]v=u+at[/tex]

Where, u = initial velocity

v = final velocity

a = acceleration

t = time

Put the value in the equation

[tex]4=0+7.2\times t[/tex]

[tex]t=\dfrac{4}{7.2}[/tex]

[tex]t=0.6\ sec[/tex]

Hence, The time is 0.6 sec.

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