Question: A body of mass m is thrown at an angle to the horizontal with the initial velocity vo. Assuming the air drag to be negligible,

A body of mass m is thrown at an angle to the horizontal with the initial velocity vo. Assuming the air drag to be negligible, find:
(a) The momentum increment Δp that the body acquires over the first t seconds of motion;
(b) The modulus of the momentum increment Δp during the total time of motion.

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Physics by Example 1st edition by W. G. Rees