iashleywalter8881 iashleywalter8881
  • 14-09-2019
  • Physics
contestada

If your car accelerates from rest at a steady rate of 4.2 m/s^2, how soon will it reach 72 km/h ( 44.7 mph or 20 m/s)?

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carlap12
carlap12 carlap12
  • 17-09-2019

Answer:

The car will reach 20 m/s in 4.76 seconds

Explanation:

The car moves following an uniformly accelerated motion, therefore we know that [tex]v=v_0+ a(t-t_0)[/tex]

Where [tex]v_0 = 0[/tex] are [tex]t_0 =0[/tex]

Then [tex]t= \frac{v}{a}=\frac{20 m/s}{4.2 m/s^{2}}=4.76s[/tex]

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