I’m just looking for the solving steps

47.04N

Explanation:

The force applied by the deranged Rugby player who wish to burn excess energy by venting it on a box around is house is as follows;

First coefficient of kinetic friction,μk

μk= Kinetic Frictional Force/Normal reaction

The normal reaction is a vertical force acting opposite to the weight of the object

Hence Normal reaction=mass of object × acceleration of free fall due to gravity (g).

Let g= 9.8m/s

Normal reaction= 15 ×9.8 =147N

Hence kinetic Frictional force = μk×Normal reaction.

0.3×147=44.1N

Now the force applied by the player overcomes the kinetic Frictional force and the object accelerates moving a distance of 5m.

Now the force the object acquires to move a distance of 5m is given by Newton's second law,F =m×a

Where m is mass of object , a is acceleration of object.

Now by looking at the formula above, we don't know acceleration.

Let's calculate the acceleration .

From Newton law of motion.

V2 = U2 + 2aS

U = 0 { the body starts from rest so initial velocity is zero}

S = 5m{ distance of object}

a = ?{ acceleration of object}

Substituting the known values we have;

1.4^2 =0+ 2× a×5

1.96 = 10a

a = 1.96/10= 0.196m/S2

Hence Force of the object =15×0.196= 2.94N

Hence the force applied by the Rugby player is the force required to overcome the frictional force plus that required to accelerate the object

44.1+2.94= 47.04N

Note: I have converted velocity in cm/s to m/s by dividing by 100

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energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this