😂😂Saaf-saaf galat hai..sir ye made in India science aap pdho Ans- infinite hai ,cause it's an ideal case as nothing about energy lose is given so the energy is conserved thus ((velocity loss will tend to zero ,not exact zero it will make a converging G.P of common ratio 19/20 thus no. Of Blocks will tend to infinity))🧑🏫🧑🏫
iam not going to argue here over this answer, as we check that gp it never converges to zero. means never zero. but when we solve the other way we put final velocity to be zero in the equation of motion. we fix that the final velocity is going to zero. but in that gp it never going to zero so you are saying infinite planks required but even you take infinite planks it still not zero. here the question was asked or treated in a real life manner where ultimately velocity becomes zero. it was asked in some national level exam and they want answer in such a way that we consider the real life situation . but in that gp it never stops. iam not saying that the gp way is wrong , but that answer was not expected in that manner ..
@@RohitSharma__physics sir..but how is any student gonna know that v must be taken 0 unless it is specified in question 🤔. Then it means the question is incomplete ,at least the question must specify whether it is an ideal case or a real life case. The above question hasn't specified whether it is a an ideal case or real life, so obviously in these situations we take ideal case ...are any parameters given in question for non idealism like loss of velocity by air friction or question is saying assume real life situation were final velocity v=0 ..... {Even American physical society has imparted assumptions of ideal case in lack of suitable conditions in her [research papers]and is acceptable throughout throughout the globe}..also great educators like H.C Verma and Walter Lwins have practice this resolve
as it is in question that how many planks are required to stop it, so it means we interpret that finally it must stop. in many cases we consider ideal cases but here its a real life situation in general kinematics. so i think NTA WAS ASKING THAT WAY.THAT WHY PEOPLE UPLOAD 11 AS ANSWER NOT INFINITY
as it passes through n planks so displacement is ns , as all planks are identical and all are offering same opposition to the bullet so net displacement is ns
Last me n me add isiliye kiya because hmara ans. 10.25 khuch aya tha. To hum number of planks 10 se less nhi le skte as answer ten se greater hai.. So minimum ten to hna hi chiaye but 10.2 koi plank nhi hga. Ya to 10 hga ya 11 .. So we take 11 .. 9 hum nhi le skte. As answer 10 se jyda aa rha hai..
YAHN PAR BODY APNA VELOCITY LOSE KR RHA HAI SO EQUATION OF MOTION USE KREGYE, THERE MAY BE SOME DIFFERENT WAYS TO SOLVE . BUT GENRALLY YOU CAN USE THIS WAY TO SOLVE THIS PROBLEM
