A truck is moving with a constant velocity of `54 km h^-1`. In which direction (angle with the direction of motion of truck) should a stone be projected up with a velocity of `20 ms^-1`, from the floor of the truck of the truck, so as to appear at right angles to the truck, for a person standing on earth ?

Options

A. `cos^(-2)(-(3)/(4))`
B. `cos^(-1)(-(1)/(4))`
C. `cos^(-1)((2)/(3))`
D. `cos^(-1)((3)/(4))`

Answer

A