A particle of mass `m` has been thrown with intial speed `u` making angle `theta` with the horizontal ground. Find the angular momentum of the projectile about an axis perpendicular to the plane and passing through the point of projection when the projectile is
`(a)` At the highest point
`(b)` About to hit the ground

Answer

(a)`("mu"^(3)sin^(2)thetacostheta)/(2g)(b)(2"mu"^(3)sin^(2)thetacostheta)/(g)`