Relative speeds between two frames

If S2 moves with a velocity v with respect to S1, how is it ensured that A1 moves with velocity -v with respect to S2.

[harshith.b.k]

Awesome teaching sir.I felt as if I am experiencing it.I thoroughly understood the concept behind your student's question sir. Thanks a lot.

[pythongamer]

Tnx sir for clear my concept perfectly 🙏🙏🙏😍😍😍😘😘😘

[sachinverma]

Very conceptual question
Thank you sir
It helps us lot

[chillaxshorts]

Sir you are my physics god
Sir I want one opportunity to touch your feet

[sapnakumarisk]

Wowww... 😦😦 that's was really awsmm ✨✨😤... I hope if our school teacher also teach us in this way... So children will don't need to spend double time and money on same concept for understanding... Like schools.. Sir you are awsm... ✨✨✨✨

[manish]

Sir I have a humble request, pls make videos on understanding of quantum mechanics, at least for beginners such that we can at least relate to the modern happenings in Science .
Sir you can consider this request from a group of people who wanted to be in the field of Science but fall to the machine life(can be said as modern slave) and feels like living in some dark age .
Thanks .

[sangitayadav]

Sir with all due respect,
This is a question from your book Concepts of physics part 1, chapter 3 Rest and motion : Kinematics
A car is moving at a constant speed of 40 km per hour along a straight road which heads towards a large vertical wall and makes a sharp 90 degree turn by the side of the wall. A fly flying at a constant speed of 100 km per hour starts from the wall towards the car at an instant when the car is 20 km away, flies until it reaches the glass pane of the car and returns to the wall at the same speed. It continues to fly between the car and the wall till the car makes the 90 degree. How many trips has it made between the car and the wall?
My question is that since the time taken by the car to cover that 20 km is half an hour, and since the fly moves with 100 km per hour speed it covered 50 km in that half an hour. During its first trip, it reaches 20 km towards the car and then returns 20 km that means it has already covered 40 km during its first trip. The rest 10 km is halfway during the second trip if we calculate the position of car and fly with relative speed but it is given in the solution that trips will go on till the car takes the turn which is infinity trips as per the solution given in the book. Even if we look into this matter generally, then if there is a fixed time and fixed amount of distance that has to be covered then infinite trips cannot be made. I have confusion regarding this hopefully I request you to clear this doubt of mine.

[manishasarkar]

Yes..
In moving frame the length decreases and time increases by the same factor gama
Theat why the velocity remains the same.

[beeta_kartikkumarathani]

THIS IS VERY HELPFUL IN MECHANICS
THANK U SIR

[sunjinwooisthebestprotagon]

My maths teacher was studied at iit kanpur by hc verma sir and now he is in fitjee and teaching maths

[himanshugupta]

Bombay is coming and Pune is already passed....

[AkashPatel-cfrs]

Sir I request you to make seperate video on projectile motion topic🙏🙏🙏🙏🙏

[keshabchandraratha]

Respected Sir, please send me some important videos of physics class 11 kinematics as early as possible.

[dishatiwarifca-]

sir I am a student of class 11th I want to take your whole class like a 1 chapter 2nd chapter respectively so what could I do for taking your regular class and be a regular student

[ppcorn]

the student(S)' question slain effectively

[alokverma]

Very nice question and the sol given by sir is fundastic

[priyanathgoswami]

Sir please teach Einstein basic postulate of theory of relativity
Sir please
मैं आपका सदा अभारी बना रहुँगा

[priyasharmaarry]

It's great time feeling paractically; that yaa rest mast equation is in

[Darshanhd_]

1) if you are given displacement & asked for velocity then differentiate once w. r. t time.
2) if you are given velocity asked & for acceleration then differentiate once w. r. t time
3)If you are given displacement & asked for acceleration then differentiate twice w. r. t time follow the pi

[AkashPatel-cfrs]

Sir in relative motion if observer is also moving same with particles then, how deal with this type of questions