Q. 24.2( 11 Votes )

A bullet of mass 20kg is fired horizontally with a velocity of 150m/s from a pistol of mass 2kg. Find recoil velocity.

Answer :


Mass of bullet = 20kg


Mass of pistol = 2kg


Velocity of pistol= 150m/s


Let, m1 = 20kg


m2 = 2kg


u1 = 0m/s


u2 = 0m/s


v1 = 150m/s


v2 =?


According to Law of Conservation of Momentum,


Initial Momentum = Final Momentum


m1u1 + m2u2 = m1v1 + m2v2


(20kg × 0m/s) + (2kg × 0m/s) = (20kg × 150m/s) + (2kg × v2)


0 = 3000 + 2v2


–1500m/s = v2


NOTE: Negative sign denotes that pistol moves opposite to that of the bullet.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Get to Know About Kepler's LawGet to Know About Kepler's LawGet to Know About Kepler's Law47 mins
Lakhmir Singh | Part1 (Gravitation)Lakhmir Singh | Part1 (Gravitation)Lakhmir Singh | Part1 (Gravitation)44 mins
Quiz | GravitationQuiz | GravitationQuiz | Gravitation33 mins
Quiz | Kaun Banega  Champion (KBC) GravitationQuiz | Kaun Banega  Champion (KBC) GravitationQuiz | Kaun Banega Champion (KBC) Gravitation33 mins
Get to Know More About Free FallGet to Know More About Free FallGet to Know More About Free Fall45 mins
Quiz | Imp. Qs. on GravitationQuiz | Imp. Qs. on GravitationQuiz | Imp. Qs. on Gravitation44 mins
Lakhmir singh | Part-2 (Gravitation)Lakhmir singh | Part-2 (Gravitation)Lakhmir singh | Part-2 (Gravitation)45 mins
Quiz | Practice Session GravitationQuiz | Practice Session GravitationQuiz | Practice Session Gravitation31 mins
Variation of Acceleration due to GravityVariation of Acceleration due to GravityVariation of Acceleration due to Gravity39 mins
NCERT | Do You Feel Force of Attraction?NCERT | Do You Feel Force of Attraction?NCERT | Do You Feel Force of Attraction?58 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses