Question

A 50-kg object is moved along a horizontal floor by a horizontal force of 98 000 dynes. If the coefficient of kinetic friction between the object and the floor is 0.10, what velocity will the object attain at the end of 3 seconds?

Answer 1

98 000 dynes is 0.98 Newtons. Check the force required to support motion at a constant speed:

$$f=\mu mg=49\text{ N}.$$

So, the body will not move and after 3 s, the velocity will be 0 m/s.