Centre of Mass 1 Question 10
10. Two particles $A$ and $B$ initially at rest, move towards each other by mutual force of attraction. At the instant when the speed of $A$ is $v$ and the speed of $B$ is $2 v$, the speed of the centre of mass of the system is
(1982, 3M)
(a) $3 v$
(b) $v$
(c) $1.5 v$
(d) zero
Assertion and Reason
Mark your answer as
(a) If Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I
(b) If Statement I is true, Statement II is true; Statement II is not a correct explanation for Statement I
(c) If Statement I is true; Statement II is false
(d) If Statement I is false; Statement II is true
Show Answer
Answer:
Correct Answer: 10. (d)
Solution:
- Net force on centre of mass is zero. Therefore, centre of mass always remains at rest.
