A flatbed truck is carrying a 20.0-kg crate down a sloping road ...

[ts19998]

A flatbed truck is carrying a 20.0-kg crate down a sloping road inclined 15.0 below the horizontal. The coefficient of static friction between the crate and the bed is 0.400.
 
  What is the maximum acceleration that the truck can have if the crate is to stay in place? A) 1.25 m/s2
  B) 0.625 m/s2
  C) 2.50 m/s2
  D) 3.16 m/s2
  E) 6.33 m/s2

Question 2

A person with normal eyesight uses a converging lens of focal length 10 cm. He holds the lens close to his eye to finish an engraving job. At what distance from the job he must hold the lens?
 
  A) -7.1 cm
  B) 7.1 cm
  C) -30 cm
  D) 30 cm
  E) 20 cm

[Yixagurpuldink]

Answer to Question 1

E

Answer to Question 2

B

[ts19998]

Gracias!

[sailorcrescent]

Thanks for the timely response, appreciate it