Rotational Motion Question 154
Question: Two bodies of masses 2 kg and 4 kg are moving with velocities 2 m/s and 10 m/s respectively along same direction. Then the velocity of their centre of mass will be
Options:
A) 8.1 m/s
B) 7.3 m/s
C) 6.4 m/s
D) 5.3 m/s
Show Answer
Answer:
Correct Answer: B
Solution:
[b]
$ \vec{v} _{c m}=\frac{m_1 \overrightarrow{v_1}+m_2 \overrightarrow{v_2}}{m_1+m_2}=\frac{2 \times 2+4 \times 10}{2+4}=7.3 \mathrm{~m} / \mathrm{s} $
