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Author Question: A 900-kg car traveling 30.0 south of east at 12.0 m/s suddenly collides with a 750-kg car traveling ... (Read 150 times)

vicky

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A 900-kg car traveling 30.0 south of east at 12.0 m/s suddenly collides with a 750-kg car traveling north at 17.0 m/s.
 
  The cars stick together after colliding. What is the speed of the wreckage just after the collision?
  A) 7.21 m/s
  B) 12.2 m/s
  C) 20.4 m/s
  D) 25.0 m/s
  E) 17.3 m/s

Question 2

An electron and a positron, both essentially at rest, annihilate each other, emitting two identical photons in the process.
 
  What is the wavelength of these photons? The mass of an electron or positron is 9.11  10-31 kg. (h = 6.626  10-34 J  s, c = 3.00  108 m/s)
  A) 3.07 pm
  B) 1.21  10-12 pm
  C) 2.42 pm
  D) 1.73 pm
  E) 3.46 pm


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BAOCHAU2803

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