A sled with a mass of 40kg is pulled along flat, snow-covered ground. The static friction coefficient is 0.40, and the kinetic friction coefficient is 0.20. A. What does the sled weigh?
B. What force will be needed to start the sled moving?
C. What force is needed to keep the sled moving at a constant velocity?
D. Once moving, what total force must be applied to the sled to accelerate it at 3.0m/s^2?

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

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