Asked by Selena
A car enters the freeway with a speed of 7.2 m/s south and accelerates uniformly for 4.2 km in 4.0 min. How fast (in m/s) is the car moving after this time?
I only need the formula.
My teacher gave us a list but did not tell the class which equation is for which.
Help please.
I only need the formula.
My teacher gave us a list but did not tell the class which equation is for which.
Help please.
Answers
Answered by
Damon
x = Xi + Vi t + (1/2) a t^2
4200 = 0 + 7.2 t + (1/2) a t^2
but t = 4 * 60 = 240 seconds
so
4200 = 7.2(240) + .5 a (240)^2
solve for a
then
v = Vi + a t
v = 7.2 + a (240)
4200 = 0 + 7.2 t + (1/2) a t^2
but t = 4 * 60 = 240 seconds
so
4200 = 7.2(240) + .5 a (240)^2
solve for a
then
v = Vi + a t
v = 7.2 + a (240)
Answered by
Selena
Thank you so much! You didn't have to solve it for me, I only needed the formula, but thanks a lot!^^
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