A photograph of the two-dimensional elastic collision of two ...

[wenmo]

A photograph of the two-dimensional elastic collision of two particles shows a particle of mass m1 approaching a stationary particle of mass m2.
 
  As a result of their interaction, the incident particle moves away along a line that makes an angle of 30 with its original path, and the other particle moves away along a line that makes an angle of 30 to the other side of the original path of the incident particle. What is the ratio of the masses, m1/m2? A) 0.5
  B) 1
  C) 2
  D) 3
  E) 4

Question 2

A monkey is sitting at the top of a tree 20 m above ground level. A person standing on the ground wants to feed the monkey. He uses a bow and arrow to launch the food to the monkey.
 
  If the person knows that the monkey is going to drop from the tree at the same instant that the person launches the food, how should the person aim the arrow containing the food? Air resistance is small enough to be ignored. A) He should aim it at the monkey.
  B) He should aim it below the monkey.
  C) He should aim it above the monkey.

[millet]

Answer to Question 1

C

Answer to Question 2

A

[wenmo]

TYSM

[cpetit11]

Excellent