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Q.) A truck is moving with a constant velocity of 54 km/h. In which direction (angle with the direction of motion of the truck) should a stone be projected up with a velocity of 20 m/s, from the floor of the truck, so as to appear at right angles to the truck, for a person standing on the earth?
[A]cos⁻¹(-3/4)
[B]cos⁻¹(-1/4)
[C]cos⁻¹(2/3)
[D]cos⁻¹(3/4)