To calculate the energy used in overcoming friction, we need to subtract the work done by the machine from the total work done. The total work done is 2500 J, and the work done by the machine is 2500 J * 0.75 (efficiency) = 1875 J.
Therefore, the energy used in overcoming friction can be calculated as:
Total work done - Work done by the machine = 2500 J - 1875 J = 625 J.
A machine of efficiency 75% done 2,500J of work calculate the energy used in over coming friction bll (833•3J)
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