Two automobiles traveling at right angles to each other collide and stick together. Car A has a mass of 1200 kg and had a speed of 25 m/s before the collision.
Car B has a mass of 1600 kg. The skid marks show that, immediately after the collision, the wreckage was moving in a direction making an angle of 40 with the original direction of car A. What was the speed of car B before the collision?
A)
16 m/s
B)
18 m/s
C)
11 m/s
D)
21 m/s
E)
14 m/s
Question 2
How many different kinds of leptons are known to exist, including antiparticles as different kinds?
A) 12 B) 4 C) 2 D) 8 E) 6
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