How much work must be done by frictional forces in slowing a ...

[Sufayan.ah]

How much work must be done by frictional forces in slowing a 1000-kg car from 26.1m/s to rest?
 
  A) 4.09  105 J B) 3.41  105 J C) 2.73  105 J D) 4.77  105 J

Question 2

Calculate the average force an outside object would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph).
 
  A) 1.8  104 N
  B) 1.6  104 N
  C) 5.4  104 N
  D) 6.5  105 N
  E) 3.2  104 N

[mceravolo]

Answer to Question 1

B

Answer to Question 2

B

[Sufayan.ah]

Excellent

[AmberC1996]

Gracias!