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A gun kept on a straight horizontal road...

A gun kept on a straight horizontal road is used to hit a car travelling on the same road away from the gun at a uniform speed of `10sqrt(2)ms^(-1)` .The car is at a distance of 150m from the gun when it is fired at an angle of `45^(@)` to the horizontal.With what speed should the shell be projected so that it hits the car? Take `g=10ms^(-2)`

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