Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति
JEE Main & Advanced
Physics
Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति
Question Bank
Elastic and Inelastic Collision
question_answer
A body of mass ?M? collides against a wall with a velocity v and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive) [EAMCET 1982]
A) Zero
B) 2Mv
C) Mv
D) ? 2 Mv
Correct Answer:
D
Solution :
Change in momentum\[=m{{\vec{v}}_{2}}-m{{\vec{v}}_{1}}\]\[=-mv-mv=-2mv\]