A body of mass 2, kg moving with a velocity of 3, m/sec collides head on with a body of mass 1, kg m

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5.Work, Energy, Power and Collision

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A body of mass $2\, kg$ moving with a velocity of $3\, m/sec$ collides head on with a body of mass $1\, kg$ moving in opposite direction with a velocity of $4\, m/sec$. After collision, two bodies stick together and move with a common velocity which in $m/sec$ is equal to

A

$1/4$

B

$1/3$

C

$2/3$

D

$3/4$

Solution

$(2 \times 3) \hat{i}+(1 \times 4)(-\hat{i})=(2+1) \vec{v}$

$2 \hat{\mathrm{i}}=3 \vec{\mathrm{v}}$

$\overrightarrow{\mathrm{v}}=\frac{2}{3} \hat{\mathrm{i}} \mathrm{m} / \mathrm{s}$

Standard 11

Physics

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