# Physics

An object of mass 4.40 kg is projected into the air at a 55 degre angle. it hits the ground 3.8 s later. what is its change in momentum while it is in the air? ignore air resistance.

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asked by Jenan
1. Impulse = M*g*(3.8 s), downward.
The launch angle and velocity are not needed for the answer, but they do determine when the object hits the ground. .

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posted by drwls
2. that doesn't work as the correct answer :/

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posted by Jenan
3. The launch velocity is 22.73 m/s, with a vertical component of 18.6 m/s. It his the top of the trajectory at 18.6/g = 1.90 s and hits the ground at 3.80 s.

If you use my suggested method, you get
momentum change = 4.40 kg*9.8 m/s^2*3.8s
= 163.9 kg m/s

Initial vertical momentum =
4.4*sin55*22.73 = 81/93 kg*m/s

That gets double on the way dwn, for a net momentum change of 163.9 kg m/s

That answer should work. Your course's "correct" answer may be wrong.

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posted by drwls

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