Question

Question with impulse & momentum

Answer 1

Problem: http://puu.sh/pEwxH/1d30928cb1.png
Solution: http://puu.sh/pEwyK/abbf945ea9.png

I don't understand why \(P \Delta t\) is at an angle :S

Answer 2

I guess my real question is -- where does P come from?

Answer 3

Where does the vertical momentum come from in the first place? From him lowering his body and then pushing off with his legs

Answer 4

I see where the vertical component of P comes from -- but I'm confused about why the resultant P is angled. Why is there a horizontal component?

Answer 5

Because he takes off at a given angle and speed - you don't know if his horiz. momentum changed

Answer 6

Horiz. is initially 10m/s
Final horiz. of 14cos60 is 7m/s

Meaning he changed momentum in x-direction (to the left)

Answer 7

Interesting -- I suppose I never really thought of that :S