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Q.

A body is projected from the origin into the space with a velocity2i^+4j^+2k^ xz is horizontal plane. The horizontal range of the projectile is g=10 ms−2

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a

425m

b

825m

c

8 m

d

4 m

answer is B.

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Detailed Solution

u→=2i^+4j^+2k^ux→=2i^+2k^   [∵xz  is  horizontal  plane]uy→=4j^|ux→|=22+22,  |uy→|=4      =22,      R=2.ux.uygR=2(22)410    = 825m
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