A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together.
(a) What is the speed of the wreckage just after the collision? (b) In what direction does the wreckage move just after the collision?
Question 2
Four point charges, each of charge 2.5 x 10-5, are located on the x- and y-axes, one at each of the locations (0, 2.0 m), (0, -2.0 m), (2.0 m, 0), and (-2.0 m, 0). The potential at the origin is
A)
2.3 105 V.
B)
4.5 105 V.
C)
3.5 105 V.
D)
1.1 105 V.
E)
0.
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