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A rocket car accelerates 4.5 m/s squared over 6.00 s to reach the freeway speed at the end of an entrance ramp. if the cars final speed is 75 m/s, what was its initial speed on it begin accelerating?

Answer :

LammettHash

Use the definition of average acceleration:

[tex]a_{\rm ave}=\dfrac{\Delta v}{\Delta t}[/tex]

Then

[tex]4.5\dfrac{\rm m}{\mathrm s^2}=\dfrac{75\frac{\rm m}{\rm s}-v_i}{6.00\,\mathrm s}[/tex]

[tex]\implies v_i=48\dfrac{\rm m}{\rm s}[/tex]

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