The efficiency of a modern bicycle is 95% if you exert 200 Joules of input work pedaling a bicycle on level ground what is the useful output work?

95 J

Explanation:

You can calculate efficiency by dividing useful output by total input, then multiplying it to 100.

So the foumula goes like:

Efficiency = (Useful output/Total input) x100

In this question,

Efficiency = 95%

Useful output = x

Total input = 200

Therefore;

95 = (x/200) x100

0.95=x/100

x=0.95x100

x=95 Joules