A child does 350 J of work while pulling a box from the ground up ...

[eruditmonkey@yahoo.com]

A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is above the ground. What is the mass of the box?
 
  A) 8.9 kg
  B) 5.3 kg
  C) 6.7 kg
  D) 8.0 kg

Question 2

Which of the following statements about spherical mirrors is correct? (There could be more than one correct choice.)
 
  A) A concave mirror always produces a real image.
  B) A convex mirror always produces a virtual image.
  C) A concave mirror always produces a virtual image.
  D) A convex mirror always produces a real image.
  E) A convex mirror always produces an upright image.

[Brenm]

Answer to Question 1

A

Answer to Question 2

B, E

[eruditmonkey@yahoo.com]

Thank you!

[Brenm]

Always glad to help...