A piece of taffy slams into and sticks to another identical piece ...

[dejastew]

A piece of taffy slams into and sticks to another identical piece of taffy at rest. The momentum of the two pieces of taffy stuck together after the collision is the same as it was before the collision.
 
  Kinetic energy is a different story, for part of it turns into heat. What percentage of the kinetic energy converts into heat?
  A) 0
  B) 25
  C) 50
  D) 75
  E) not enough information

Question 2

In a diffraction grating experiment, light of 600 nm wavelength produces a first-order maximum 0.350 mm from the central maximum on a distant screen.
 
  A second monochromatic source produces a third-order maximum 0.870 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source?
  A) 479 nm
  B) 497 nm
  C) 567 nm
  D) 749 nm
  E) 794 nm

[softEldritch]

Answer to Question 1

Answer: C

Answer to Question 2

B

[dejastew]

TYSM

[debra928]

Gracias!