Physics

Problem

For two bodies of masses

m_1

and

m_2

moving along the same straight line with speeds

u_1

and

u_2

respectively, they collide and stick together. Which expression gives their common speed

v

just after the collision? a)

\dfrac{u_1+u_2}{2}

\dfrac{m_1 u_1 + m_2 u_2}{m_1 + m_2}

\dfrac{m_1 u_1 - m_2 u_2}{m_1 + m_2}

\dfrac{m_1 u_1 + m_2 u_2}{m_1 - m_2}