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Second Law of Motion

nbsp;A bullet...

Question

A bullet of mass 7 kg is fired into a block weighing 7 kg , which is free to move. What is the initial velocity of bullet if the velocity of the block with bullet inside is 0.7 m/s?

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Solution

P_initial = P_final
P_initial = m_bullet v_bullet + M_block v_block
P_initial = (7 kg) v_bullet + 0
P_final = M_combo v_combo
P_final = (14)(0.70 m/s)
P_final = 9.8 kg-m/s
P_initial = P_final
P_initial = (7 kg) v_bullet = 9.8 kg-m/s
v_bullet = 1.4 m/s

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