speed of car

Question

speed of car

anonymous · Answer

attachment

anonymous · Answer

draw an FBD first

anonymous · Answer

i did

anonymous · Answer

find acceleration first from FBD.
Then use kinematics equation

anonymous · Answer

$F_{net}= ma\F_{net}=F_{applied}-F_{friction}\a=\frac{V_f-v_i}{t}$
combining these formulas, you will have:
$F_{net}=F_{net}\F_{applied}-F_{friction}=ma\F_{applied}-F_{friction}=m(a=\frac{V_f-v_i}{t})$

substitute your givens and solve for Vf

anonymous · Answer

oops last line should be: $\LARGE F_{applied}-F_{friction}=m(\frac{V_f-V_i}{t})$

roadjester · Answer

@m806texas Ya know, it's kinda creepy since I also have a test tomorrow.

)

isaiah.feynman · Answer

What @Data_LG2 did is no different from what I showed. http://openstudy.com/study#/updates/53040753e4b024fe26e3cb15

anonymous · Answer

yea i was telling you thanks

isaiah.feynman · Answer

Didn't seem to trust my solution.

anonymous · Answer

hmm. looks same to meh ^.^
i got approx. 7.666666667 m/s

masumanwar · Answer

speed of a car depend on the engine power and also on the weight and transmission and light weight and modern transmission hybrid electric car is fastest now

anonymous · Answer

a 3rd opinion doesnt hurt.....

and im in introductory physics ...all that is not necessary @masumanwar

isaiah.feynman · Answer

Yes. That's for engineering.

roadjester · Answer

@m806texas ready for the test tomorrow?

anonymous · Answer

well im not an engineering major

anonymous · Answer

@roadjester  kind of...

roadjester · Answer

haha; don't worry, you're not the only one.
Just remember what I said before.

anonymous · Answer

ok. its at 10 am . i have 45 min to answer 8 questions that cover 4 chapters.