\(1.96 .\) A body of mass \(m\) is thrown at an angle to the horizontal with the initial velocity \(\mathbf{v}_{0}\). Assuming the air drag to be negligible, find: (a) the momentum increment \(\Delta\) p that the body acquires over the first \(t\) seconds of motion; (b) the modulus of the momentum increment \(\Delta\) p during the total time of motion.