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das1130 das1130
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11 years ago
A pontoon boat (weight 1200 lb) sits at rest on a still on a lake near a dock.  Your friend Dana, whose weight is 160 lb, runs off the end of the dock at a speed of 15 mi/h and jumps onto the deck of the boat.  Dana does not know anything about physics and so is surprised that the boat ends up moving away from the dock.  How fast is it moving after Dana lands?
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#1
11 years ago
m=mass, v=velocity (or speed)
boat  + Dana = Boat & Dana
m1v1 + m2v2 = mFvF (F=final)
1200*0 + 160*15 = (1200+160)*vF
0+2400=1360*vF
2400/1360=vF
1.765 mi/h=vF

Hope this helps Smiling Face with Open Mouth
If it's not right it's cause I'm used to working with metres & metres per second
But I'm 90% sure this is right Slight Smile
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