Answer :
The average force on the block dragged across the floor is 7.64 Newton.
We know that the work done on a body is equal to the change in kinetic energy of the body as per the work energy theorem.
The block is dragged across the floor for a distance 55m and the blog gains 420 Joules of energy.
We can assume that the net average force on the block is F.
So, we can write the equation,
Fs = ∆K
Here,
F is the average force,
s is the distance to which the block is dragged,
∆K is the energy gained.
Putting values,
F(55) = 420
F = 7.64N.
So, the net force on the block is 7.64 Newton.
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