A 75-N object is pulled on a horizontal surface by a horizontal ...

[nummyann]

A 75-N object is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force exerted on this object is 30 N to the left. What is the acceleration of the object?
 
  A) 0.27 m/s2
  B) 1.1 m/s2
  C) 2.6 m/s2
  D) 11 m/s2

Question 2

Which one of the following does not contribute to the problem of greenhouse-effect heating of the atmosphere?
 
  A) automobile engines
  B) wood stoves
  C) nuclear power plants
  D) coal-burning power plants
  E) Actually, all of the above contribute to the problem.

[shaikhs]

Answer to Question 1

C

Answer to Question 2

C

[nummyann]

TYSM

[yeungji]

Thanks for the timely response, appreciate it