A point object is moving with a speed of \( 5 \mathrm{~m} / \mathrm{s} \) infront of a mirror mo...

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A point object is moving with a speed of \( 5 \mathrm{~m} / \mathrm{s} \) infront of a mirror moving with a speed of \( 2.5 \mathrm{~m} / \mathrm{s} \) as shown in figure. The velocity of image of the object with respect to ground is \( \sqrt{10 \mathrm{x}} \mathrm{m} / \mathrm{s} \), then \( \mathrm{x} \) is
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