Good questions for JEE (A) 2020/21

Now I’m feeling good cuz I solved this in the paper… probably wasted a lot of time in the paper

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But this what the paper setter’s trap…
Bcz such ques seem doable but suck lot of time…which could have been invested to do 2 - ques

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Can anyone understand this question and tell me , the commas in end are confusing since its correspond to three vectors respectively.

How did you do it? I tried via contact forces between rod and block and got equation which was not proceeding further

(abx) (bcy) and (caz) are each coplanar (the three vectors in parenthesis)

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Ok got it! Priniting confused me,
What about that rotation one

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You did right , thats why teachers tell to leave rotation and do it at end.

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Oh wait a min !! I think i got the rotation one using WPE

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use energy equations
change in PE of rod = (1/2)*mv²(of block) + (1/2)Iw²(of rod)
find the relation between w and v by using constraint at the point of contact --> relative velocity=0 along perpendicular direction of rod

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Yeah got it just now.
It just looked hard , was simple 2 equations.

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Hint: Break (2r-1) into [(50+r)-(50-r+1)]

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@Amish_1706 is the answer for the probability question D

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Yes, correct…do post your solution

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Solution for that probability question :point_up_2:t2:

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I am not getting correct answer , please see this

Is k =2 ? @JEE2020

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Yep please send solution


Though a very easy question, but involved multi concept so thought of sharing it…
Answer is 3…

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