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# A man of mass (m_A) is sitting in a train movingwith velocity v_1 = 3 m/s . He observe that a block of mass m_B is moving towards him with v

A man of mass () is sitting in a train movingwith velocity  . He observe that a block of mass  is moving towards him with velocity . Then the kinetic energy of block w.r.t  man is (Assume )

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K.E of the block from the reference frame of the train is

$\frac{1}{2} m (v_1+ v_2) ^2$

$\\=\frac{1}{2} \times 5 \times [ 3+5] ^2 = 1/2 \times 5 \times 64\\ \\ =5 \times 32 = 160 J$

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