A mass of \( 20 \mathrm{~kg} \) moving with a speed of \( 10 \mathr...

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A mass of \( 20 \mathrm{~kg} \) moving with a speed of \( 10 \mathrm{~m} / \mathrm{s} \) collides with another stationary mass of \( 5 \mathrm{~kg} \). As
\( \mathrm{P} \) a result of the collision, the two masses stick

W together. The kinetic energy of the composite mass will be
(1) 600 Joule
(2) 800 Joule
(3) 1000 Joule
(4) 1200 Joule
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