show directly that the time rate of change of the angular momentum about the origin for a projectile fired fromthe origin(constant g) is equal to the...

show directly that the time rate of change of the angular momentum about the origin for a projectile fired fromthe origin(constant g) is equal to the moment of force(or torque) about the origin.

Let us assume that the projectile is fired with initial speed u at an angle θ above the horizontal at timet = 0.At time t , the velocity and the position of the projectile will be,v = u cos θ...