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A boy of mass 30 kg is standing at one e...

A boy of mass 30 kg is standing at one end on a stationary boat over a lake. The boat has a mass 70 kg and length 10 m. Now the boy walked to the other end of the boat. Relative to the ground

A

2`pisqrt ((m_1 + m_2)/k), `(mum_2g)`/k

B

2`pisqrt ((m_1 + m_2)/k)`, `(mum_1g)`/k

C

2`pisqrt ((m_1 + m_2)/k)`,`(mu(m_1+ m_2))`/k

D

2`pisqrt ((m_1 + m_2)/k)`, `(mug(m_1+ m_2))`/k

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