A steel ball bearing of mass m1 and speed of magnitude v1 has a ...

[jrubin]

A steel ball bearing of mass m1 and speed of magnitude v1 has a head-on elastic collision with a steel ball bearing of mass m2 at rest. Rank the speed v1 of m1 relative to v2, the magnitude of the speed of m2, after the collision when i) m1 > m2; ii) m1 = m2; and iii) m1 < m2.
 a. v1 < v2; v1 < v2; v1 < v2
  b. v1 < v2; v1 = v2; v1 > v2
  c. v1 < v2; v1 > v2; v1 > v2
  d. v1 > v2; v1 = v2; v1 < v2
  e. v1 > v2; v1 > v2; v1 > v2

Question 2

Two bodies of equal mass m collide and stick together. The quantities that always have equal magnitude for both masses during the collision are
 a. their changes in momentum.
  b. the force each exerts on the other.
  c. their changes in kinetic energy.
  d. all of the above. e. only (a) and (b) above.

[Natalie4ever]

Answer to Question 1

B

Answer to Question 2

E

[jrubin]

TYSM

[ryhom]

Gracias!