A block of mass M slides down a frictionless plane inclined at an ...

[sc00by25]

A block of mass M slides down a frictionless plane inclined at an angle  with the horizontal. The normal reaction force exerted by the plane on the block is
 
  A) Mg sin .
  B) zero, since the plane is frictionless.
  C) Mg cos .
  D) Mg.
  E) Mg tan .

Question 2

A 35 N-force toward the west is applied to an object. The object moves 20 m east during the time the force is applied. What is the change in kinetic energy of the object?
 
  A) 0.0 J
  B) 0.57 J
  C) 1.0 J
  D) -700 J
  E) 350 J

[ttt030911]

Answer to Question 1

C

Answer to Question 2

D

[sc00by25]

Gracias!

[helenmarkerine]

Thanks for the timely response, appreciate it