A rocket taking off straight upward develops a thrust of 10,000 ...

[jrubin]

A rocket taking off straight upward develops a thrust of 10,000 newtons. The rocket weighs 2,000 newtons. The net force on the rocket, neglecting air resistance, is
 
  A) 8,000 newtons.
  B) 2,000 newtons.
  C) zero.
  D) 12, 000 newtons.
  E) 10,000 newtons.

Question 2

Recoil is noticeable if we throw a heavy ball while standing on a skateboard. If instead we go through the throwing motion but hold onto the ball, without friction effects our net recoil will be
 
  A) zero.
  B) the same as before.
  C) small, but noticeable.

[Smiles0805]

Answer to Question 1

A

Answer to Question 2

Answer: A

[jrubin]

TYSM

[matt95]

Excellent