If the kinetic energy of an oblique proj maximum height is half of its initial kinetic energy then the angle of throw with the

Question

If the kinetic energy of an oblique proj maximum height is half of its initial kinetic energy then the angle of throw with the vertical is 1 30 Cost 3 45 2 37 0 45 4 60 COScus D If resultant of two unit vectors and b is also a

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