Someone please help me!!!

- YumYum247

Someone please help me!!!

- schrodinger

I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!

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- anonymous

good luck :)

- YumYum247

Thanks :)

- YumYum247

49e) Determine the velocity of the elevator 12 sec after the passengers have entered the elevator.

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## More answers

- YumYum247

@Abhisar

- Abhisar

Ok, what's the question?

- YumYum247

49e) Determine the velocity of the elevator 12 sec after the passengers have entered the elevator.

- Abhisar

Have you calculated the net acceleration?

- YumYum247

10.29m/sec^2 = Net Acceleration

- Abhisar

You can use v=u+at now to find v after 12 seconds.

- YumYum247

but i don't know my initial velocity!!

- YumYum247

i was plannign on using Vf = Vi X a.t but i don't have the initial velo

- Abhisar

Applied force - (Frictional force + Gravitational Force) = Net Force

- YumYum247

ok?

- YumYum247

what do i do with that?!?!?!? what will i get tho?!?!?!?

- Abhisar

I think you have calculated the net accn wrong...

- YumYum247

can you please take 2 seconds and go back and read 49b)

- YumYum247

it's at the top.

- Abhisar

Ok, let's see that part again.
There are 3 forces acting on the elevator. Force due to the elevator cable upwards, force of friction downwards and gravitational force downwards. Right?

- YumYum247

are you saying that i should have combined the frictional and gravitational forces?!?!?
Applied force - ""(Frictional force + Gravitational Force)"" = Net Force

- YumYum247

yes that;s right!

- Abhisar

Yeah, that's what i am saying !!

- YumYum247

but i didn't include the gravitational force for some reason idek.
i though once an object overcome the force of gravity, the effects of gravity don't count.

- Abhisar

No that's not true..

- YumYum247

ok please help me here for a sec. If an object is travelling faster than 9.80m/sec^2 up, does the effects/ the gravitational force count?

- Abhisar

Yes, gravity is always working. Suppose a body is of mass 1 Kg is travelling with an acceleration 10m/s^2 then it means that force acting on it is 20 N. 10 N is used in neutralising the gravitational force and then other 10N for giving its acceleration.

- YumYum247

because imagine if your inside an elevator which is going at 15m/sec^2, your initial mass is 50Kg, would you not feel heavier due to the sheer upward force the evelator is pressing you with?????

- Abhisar

Read this
http://hyperphysics.phy-astr.gsu.edu/hbase/elev.html

- YumYum247

ok...so once i have my net acceleration how do i determine the velocity of the elevator?
Please just leave the formula. and i'll do the rest :)

- Abhisar

v=u+at
V is your final velocity, u is your initial velocity which is 0 in this case, a and t are acceleration and time.

- YumYum247

ok Thanks and I Love you!!! Muuuuuha :"D
GOD BLESS YOU DEAR. Long Live!!

- Abhisar

o_O
You're welcome..

- YumYum247

:"D

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