Version A 9. Th e x and y coordinates in meters of the center of mass of the thr

Question

Version A 9. Th e x and y coordinates in meters of the center of mass of the three particle system shown below are: Page 3 of 3 a. 0,0 b. 1.3m, 1.7 m c. 1.4 m, 1.9m d. 1.4 m, 2.5m e. 1.9 m, 2.5 m 10. A 0.5-kg baseball is thrown horizontally at 20 m/s. The ball was in contact with the wall for 3 ms m/s It strikes a vertical wal and rebounds at 4 Magnitude of the average force on the wall a. zero b. 4000 N C. 997 N d. 96N e. 36 N 11. Magnitude of impulse due to the colision with the wallin Qei a. zero b. 4000 N.s c. 1200 N.s d. 12 N.s e. 6 N.s 12. Object A (mass 200 kg) moving along a straight line at 10 mis collides head-on with ctiject mass 100 kg) moving at 5 m/s along the same drectc velocities of object A and B are: VB-15 mis a.Va= 6.67 m/s VB = 11.66 mis vB =0 6.67 m/s = 10m/s VA = Page 3 of 3 C. Ve = 11.66 mis e.VA = 6.67 m/s

Explanation / Answer

1) 6 Kg at (1,3) 5 Kg at (3,2) 4 Kg at (0,0)

So com = (1.4,1.86) m (ans) (C) (ans)

2)F = dP/dt = 0.5*(4 - -20) /0.003 = 0.5*24*1000/3 = 4000 N (B) (ans)

3) J = dP = 0.5*24 = 12 Nsec (D) (ans)

4)

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