A construction worker puts 20J of energy in to one strike of his hammer on the head of a nail. The energy transferred to driving d nail in to d wood is 8J. What is d efficiency of d construction worker's hammering?

efficiancy=40 percent

Explanation:

efficiency=energy output/energy input*100

efficiancy=8J/20J*100

efficiancy=0.4*100

efficiancy=40 percent

Mark brianliest if my answer suit your question ...

The efficiency can be found using the formula;

efficiency=energy output divided by energy input * 100%.

efficiency=8.0j: 20j * 100%

efficiency=0.4 * 100%

efficiency=40%.

the efficiency of the hammer strike was 40%. vibration and heating of the nail are two possible reasons for the energy loss.