physics question ....

Question

anonymous · Answer

wrong section ;)

anonymous · Answer

attachment

anonymous · Answer

@experimentX  plz explain one by one .. i really need now we will discuss over each one.... i need to understand everything clearly :)

experimentx · Answer

you just need to understand what velocity and acceleration is

anonymous · Answer

attachment

experimentx · Answer

http://www.youtube.com/watch?v=oRKxmXwLvUU

anonymous · Answer

@experimentX   1st open 29th image ..

experimentx · Answer

http://www.youtube.com/watch?v=FOkQszg1-j8&feature=relmfu

anonymous · Answer

y t1 = 0 ?

anonymous · Answer

i have watched these lectures :) :) :) even then thank u :)

anonymous · Answer

@experimentX   explain one by one i will ask u question in between

experimentx · Answer

okay ,,, you have a stop watch, you travel to your friend place ... how will you calculate how long does it take for you to take to go your friend palce

anonymous · Answer

1st i will set initial time when leaving for his house then when i reached at his home i will look at the time and find out the difference .... so simple

experimentx · Answer

yeah ... better if you set the initial time = 0
even if you don't do, final time - initial time = ... will be same.

anonymous · Answer

the problem is in image # 32 ... i couldn't understand that

experimentx · Answer

put put t2 = t and v2 = v and v1 = u and simplify it.

anonymous · Answer

why we have taken acceleration constant and in image #32 for what we are simplying ?

experimentx · Answer

because it is an assumption that acceleration is constant.

anonymous · Answer

@experimentX  ..... if accel is const -> velocity is const?

experimentx · Answer

no ...

experimentx · Answer

if acceleration is constant then velocity is constantly increasing ... that's why i told you to understand these basic things first. if you understand it, modelling it mathematically is just a pice of cake.

anonymous · Answer

hey hey ... @experimentX ... if accel is const maybe velocity is decreasing constantly this maybe the case too :)

experimentx · Answer

in this case,
if accn = +k velocity is increasing constantly
if accn = -k velocity is decreasing constantly ..

it has nothing to do with the above equation ... the above equation is in more general form.

anonymous · Answer

@experimentX  do u have any other basic physics lectures except khan

experimentx · Answer

no sorry ...

anonymous · Answer

it's alright :) thanks alot :) :) :) experiment

experimentx · Answer

yw ..