Final answer:
The work output (Wo) of the simple machine is 40 Joules, calculated using the formula Wo = F × d. To calculate the work input and efficiency accurately, additional information regarding the machine's effort force and the distance over which it acts is required.
Step-by-step explanation:
To calculate the work done by a simple machine, we use the formula W = F × d, where W is work, F is the force, and d is the distance through which the force acts.
Work Input (Wi)
The work input is the initial energy supplied to the machine. Since more information is required to determine this (like the force applied), and it's not specified, we can't calculate it with the details provided.
Work Output (Wo)
The work output, Wo, is the energy the machine outputs, which can be calculated. It is given by:
Wo = F × d = 20N × 2m = 40 Joules
Efficiency
The efficiency of a machine is the ratio of the work output to the work input, usually expressed as a percentage:
% efficiency = (Work output / Work input) × 100
Without the work input, we cannot calculate the efficiency accurately. More information is needed about the work input or the applied effort and the distance moved by the effort force.