Question

2. plane flying horizontally at a height of 1500 m with a velocity of 200 ms- passes directly overhead an intiaircraft gun. Then the angle with the horizontal at which the gun should be fired for the shell with a muzzle velocity of 400 m s- to hit the plane, is - (A) 90° (D) 45° (C) 30% (B) 60 an obliquo proiection

JEE/Engineering Exams

Physics

Solution

253

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from this Pon no At ter t the plane. The dis temee coverod by plane - horizontal olistence of bullet ( 200 t=(400 cos 0) t ) ( begin{aligned} frac{1}{2} &=cos theta theta &=60^{circ} text { , sin horizontel } end{aligned} )