Author Question: A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20 ... (Read 121 times)

debasdf · **on:** Jul 28, 2018

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.