A projectile of mass m is launched with an initial velocity i making an angle ?

Question

A projectile of mass m is launched with an initial velocity i making an angle ? with the horizontal as shown below. The projectile moves in the gravitational field of the Earth. Find the angular momentum of the projectile about the origin when the particle is at the following locations. (Use the following as necessary: vi, ?, m, and g for the acceleration due to gravity.)



(b) at the highest point of its trajectory
=

(c) just before it hits the ground
=

(d) What torque causes its angular momentum to change?

Explanation / Answer

here's my answer uploaded :

http://imgur.com/sy8XN

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