A 5.0-kg object is pulled along a horizontal surface at a ...

[debasdf]

A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20 above the horizontal. How much work is done by this force as the object moves 6.0 m?
 a. 78 J
  b. 82 J
  c. 85 J
  d. 74 J
  e. 43 J

Question 2

A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2 . At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time.

[Leostella20]

Answer to Question 1

C

Answer to Question 2

14.1 m/s, 28.3 s

[debasdf]

Excellent

[Jossy]

Gracias!