http://tinypic.com/view.php?pic=j755wy&s=8#.U-FX1lZycpE << vf vs vi graph. slope

Question

http://tinypic.com/view.php?pic=j755wy&s=8#.U-FX1lZycpE << vf vs vi graph. slope= .604 (incase u cant read it)

1. Examine the graph of final velocity vs. initial velocity during an inelastic collision between a moving cart "m" moving at 2m/s and a stationary cart of mass "M". From the slope of the graph, how big is vf (V final)?

3/5 m/s

5/3 m/s

6/5 m/s

5/6 m/s

.604 m/s

2. Calculate the momentum of a 12 m3of air (density of 1.3kg/m3) hitting a sky diver traveling 50 m/s.

Please remember proper units and significant figures.

3/5 m/s

5/3 m/s

6/5 m/s

5/6 m/s

.604 m/s

Explanation / Answer

1)Vf=mVi/(M+m)

Vf/Vi =0.604 =m/M+m

Vf=2*0.604=1.208 m/sec =6/5 m/sec

So option 3 is correct (ans)

2)Momentum =MV =rho*Volume*V =12*1.3*50 =780 Kgm/sec (ans)

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