A 2.0-kg block slides down a frictionless incline from point A to ...

[nenivikky]

A 2.0-kg block slides down a frictionless incline from point A to point B. A force (magnitude P = 3.0 N) acts on the block between A and B, as shown. Points A and B are 2.0 m apart. If the kinetic energy of the block at A is 10 J, what is the kinetic energy of the block at B?
 
   

   
  a.
  27 J
   
  b.
  20 J
   
  c.
  24 J
   
  d.
  17 J
   
  e.
  37 J

Question 2

A block slides on a rough horizontal surface from point A to point B. A force (magnitude P = 2.0 N) acts on the block between A and B, as shown. Points A and B are 1.5 m apart. If the kinetic energies of the block at A and B are 5.0 J and 4.0 J, respectively, how much work is done on the block by the force of friction as the block moves from A to B?
 
   

   
  a.
  3.3 J
   
  b.
  +1.3 J
   
  c.
  +3.3 J
   
  d.
  1.3 J
   
  e.
  +4.6 J

[nixon_s]

Answer to Question 1

c

Answer to Question 2

a

[nenivikky]

Wow, this really help

[ghepp]

TYSM