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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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Sir why do we add a = 2m/s² when the observer is inside lift and doesn't consider it ?

2 years ago by Shubham

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Why not calculated time at initial velocity at 5 m/s ?

3 years ago by

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Sir, can time should be same when we pute u=5 m/s isted of u=0 ?

3 years ago by

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sir!! why we tahe acceleration only be g while we are talking with net acceleration with respect to ground....

4 years ago by Shubham Vig

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sir why have you taken relative acceleration positive ?

6 years ago by Dharamjeet Singh

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quset 3 ques 14 ans should be c

6 years ago by Silla Priyadarshni

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sir why we are taking velocity with respect to ground as 5 m/s?

6 years ago by Aakash

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I found out Vel. of bolt wrt lift =4(3)^1/2 m/s. Now I used the formula of relative velocity as Vel. Of bolt wrt lift + Vel.of lift wrt grd= Vel. Of bolt wrt grdie. -4(3)^1/2 + 5 = 5+ 4(3)^1/2m/s using this i got vel. Of bolt wrt grd=5-4(3)^1/2 m/s which is different from the answer 5-10/(3)^1/2 m/s....so where am I wrong and why....plz help

7 years ago by Chetan Gupta

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why we have taken u negetive??

8 years ago by sudeep khare

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why did we add the accelerations they are in opposite directions so the net acceleration should be 8....pls help

9 years ago by nishita

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Sir.. if we take everything with respect to ground bolt's U=+5m/s a=-10 and s=-2........ then we get v=root 65 sir?

9 years ago by JS.Akshaiy Ramlinkam

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and how can u take s=-2 wen u've considered lift as reference frame?

9 years ago by JS.Akshaiy Ramlinkam

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If you are taking ground as reference frame then you cannot use s=-2 in 3rd eq. because s=-2 when we take lift as reference frame. The person at ground observes a different displacement s of bolt which can be cal. as s=5(1/root3)-1/2*g*1/3 and then you put s in 3rd eq. to get velo. final. But it is very complex procedure so you can use 1st eq. to get direct result...

8 years ago by sudeep khare

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I have the same doubt as asked by Suhail Hakeem.

9 years ago by Apurv Upreti

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g can be considered in all ref frames as body weight acts everywhere due to gravity... but in other reference frames we consider relative acceleration...

9 years ago by Physics Galaxy

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Sir, why we consider 'g' only in frame of reference of ground?

9 years ago by Suhail Hakeem

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g can be considered in all ref frames as body weight acts everywhere due to gravity... but in other reference frames we consider relative acceleration...

9 years ago by Physics Galaxy

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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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