A 2.3-kg object traveling at 6.1 m/s collides head-on with a ...

[biggirl4568]

A 2.3-kg object traveling at 6.1 m/s collides head-on with a 3.5-kg object traveling in the opposite direction at 4.8 m/s. If the collision is perfectly elastic, what is the final speed of the 2.3-kg object?
 
  A)
 
  0.48 m/s
 
  B)
 
  7.1 m/s
 
  C)
 
  3.8 m/s
 
  D)
 
  4.3 m/s
 
  E)
 
  6.6 m/s

Question 2

A myopic (nearsighted) dancer wears eyeglasses that allow him to have clear distant vision. The power of the lenses of his eyeglasses is -3.00 diopters. Without eyeglasses, what is the far point of the dancer?
 
  A) 0.50 m B) 0.17 m C) 0.42 m D) 0.33 m E) 0.25 m

[Dunkey]

Answer to Question 1

B

Answer to Question 2

D

[biggirl4568]

Excellent

[jomama]

Gracias!