Work Energy And Power Question 86
Question: 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]
Options:
A) Zero
B) 2Mv
C) Mv
D) ? 2 Mv
Show Answer
Answer:
Correct Answer: D
Solution:
Change in momentum $ =m{{\vec{v}}_2}-m{{\vec{v}}_1} $
$ =-mv-mv=-2mv $
