## Kumar Ketan is teaching live on Unacademy Plus

Home ExploreSearch Courses, Topics &Educators 0 minutes today Kumar Ketan Hey, this is kumar Ketan. I'm graduate in physics and doing further studies. I Edit Profile would love to teach you and give you all my knowledge. 415 Views in last 30 days 1,377 Lifetime Views 7 Courses 499 Followers Following Course Overview Expected topics of Current Affairs for SSC/1BPS/UPSC/PCS/UPPSC/ALL OTHER GOVERNMENT EXAMS with some details COLLISION A col ision as an isolated event in which two or more colliding bodies exert relatively strong forces on each other for a relatively short time CURRENT AFFAIRS Expected topics of General Awareness for UPSC CSE/SSc/ Railway with some details Collision between particles have been divided broadly into two typer: 1. Elastk collision st VOTE enroll By Kumar Ketan By Kumar Ketan By Kumar Ketan (Hindi) Collision for IIT JEE (Hindi) Current Affairs 2018 for UPSC CSE (Hindi) General Awareness: Most Important 50 Question for. 23 Lessons 6 Lessons https://unacademy.com/user/KumarKetan

PROBLEMS OF COLLISIONS Advanced Level (Asked in IIT JEE) 3

Two small particles of equal masses start moving in opposite directions from a point "A" in a horizontal circular orbit. Their tangential velocities are "v" and "2v", respectively, as shown in figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other that at "A", these two particles will again reach the point "A"? IT-JEE 2009] (a) 4 (b) 3 (c) 2 (d) 1

Fig-a

. Solution: Particle with velocity covers an angle of 120% and after collision its velocity become '2V'. It will cover angle of 240 So number of elastic collisions is 2. 60 2v 2v 1st collision 2" collision

The block of mass "M" moving on the frictionless horizontal surface collides with the spring of spring constant k and compresses it by length L. The maximum momentum of the block after collision is- [IT JEE-2005] (a) Mk L 2M (c) zero (d) AML2

-imv2 Let initial velocity of block is v then initial energy Final potential energy From energy conservation 2 2 1 2 2 Therefore maximum momentum mv 7n

Directions: This question contain statement 1 and statement 2 of the four choices given after the statement choose the one that best describes the two statements. IIT JEE 2010 Statement-1: Two particles moving in the same direction do not lose all their energy in a completely inelastic collision. Statement-2: Principle of conservation of momentum holds true for all kinds of collisions. 1. 2. 3. 4. Statement-1 is false, statement-2 is true Statement-1 is true, statement-2 is false Statement-1 is true, statement-2 is true; Statement-2 is the correct explanation of Statement-1 Statement-1 is true, statement-2 is true; Statement-2 is not the correct explanation of Statement-1