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 )

# Engineering

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 velocity $v_2 = 5 m/s$ . Then the kinetic energy of block w.r.t man is (Assume $m _B= 5 Kg$ )

Answers (1)

S safeer

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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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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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 velocity $v_2 = 5 m/s$ . Then the kinetic energy of block w.r.t man is (Assume $m _B= 5 Kg$ )