A puck of mass m moving at speed v on a horizontal, frictionless surface is stopped in a distance d because a hockey stick exerts an opposing force of magnitude F on it. If the stopping distance d increases by 58 %, by what percent does the average force needed to stop the puck change, assuming that m and v are unchanged?

-36.71%

Explanation:

Using the Generalized Work Energy Principle, the puck is brought to rest by an external force and the system has no kinetic energy

#Denote the stopping distance and force required with a prime and observe from (i) that:

 #If stopping distance increases by a factor of 79/50;

So F decreases by 36.71% . we expect force to reduce since the same amount of work is repeatedly done on the system over a long distance.

increase masses, decrease separation

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.