Two particles are projected with speed \( 4 \mathrm{~m} / \mathrm{s} \) and \( 3 \mathrm{~m} / \...

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Two particles are projected with speed \( 4 \mathrm{~m} / \mathrm{s} \) and \( 3 \mathrm{~m} / \mathrm{s} \) simultaneously from same point as shown in the figure. Then:
(1) Their relative velocity is along vertical direction
(2) Their relative acceleration is nonzero and it is along vertical direction
(3) They will hit the surface simultaneously
(4) Their relative velocity is constant and has magnitude \( 1.4 \mathrm{~m} / \mathrm{s} \)
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