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Last updated at May 24, 2019 by Teachoo

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NCERT Question 11 Two objects, each of mass 1.5 kg, are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m sโ1 before the collision during which they stick together. What will be the velocity of the combined object after collision? Mass of object 1 = ๐_1 = 1.5 kg Mass of object 2 = ๐_2 = 1.5 kg Velocity of object 1 = u1 = 2.5 m/s Velocity of object 2 = u2 = โ 2.5 m/s Note: u2 is negative since it is in opposite direction of u1 After collision, the objects stick together โด Combined mass = m1 + m2 = 1.5 + 1.5 = 3 kg Velocity of combined object = v Finding momentum before and after collision Momentum before Momentum = Momentum of Object 1 + Momentum of Object 2 = 1.5 ร 2.5 + 1.5 ร (โ2.5) = 1.5 ร 2.5 โ 1.5 ร 2.5 = 0 Momentum after Momentum = Total Mass ร Velocity After = 3 ร v = 3v Momentum after Momentum = Total Mass ร Velocity After = 3 ร v = 3v According to law of conservation of momentum, Total momentum before collision = Total momentum after collision 0 = 3v v = 0/3 v = 0 m/s

NCERT Questions

NCERT Question 1

NCERT Question 2

NCERT Question 3

NCERT Question 4

NCERT Question 5

NCERT Question 6

NCERT Question 7

NCERT Question 8

NCERT Question 9

NCERT Question 10

NCERT Question 11 You are here

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NCERT Question 16

NCERT Question 17

NCERT Question 18

Class 9

Chapter 9 Class 9 - Force and Laws Of Motion

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.