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Physics

Grade-8

Easy

Question

Mathematically represent, “The sum of momenta of the two objects before collision is equal to the sum of momenta after the collision, provided there is no external unbalanced force acting on them.”

$m_{1} u_{1} + m_{2} u_{2} = m_{1} v_{1} + m_{2} v_{2}$
$m_{1} v_{1} + m_{2} u_{2} = m_{1} u_{1} + m_{2} v_{2}$
$m_{1} u_{1} + m_{1} v_{1} = m_{2} v_{2} + m_{2} u_{2}$
$v_{1} u_{1} + v_{2} u_{2} = m_{1} v_{1} + m_{2} v_{2} + m_{1} u_{1} + m_{2} u_{2}$

The correct answer is: $m subscript 1 end subscript u subscript 1 end subscript plus m subscript 2 end subscript u subscript 2 end subscript equals m subscript 1 end subscript v subscript 1 end subscript plus m subscript 2 end subscript v subscript 2 end subscript$

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