in amachine the load moves 2 metres when the effort moves 8 metres if an effort of 20 newton is used to raise a load of 60 newton ,what is the efficiency of the machine?​

The best answer is (a) which is universal law is in effect at all times. it is constantly at play in everything we do and governs our lives. it is also important to note that universal law applies to not only everything on earth, but everything in the universe as well, which is another reason why it is in effect at all times.

Since the pully is a simple machine so the mechanical advantage is a 1