An explosion breaks a rock into three parts in a
horizontal plane. Two of them go off at right angles
to each other, the first part of mass 1 kg moves
with a speed of 12 ms-7 and the second part of
mass 2 kg moves with 8 ms-' speed. If the third
part flies off with 4 ms-7 speed, then its mass is
[NEET-2013]
(1) 5 kg
(2) 7 kg
(3) 17 kg
(4) 3 kg
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Answer:
the mass of stone is a) 5kg
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