Question

Plzz help
its science

Answer 1

The efficiency : 95%

Further explanation

Efficiency : the ratio between output and input work

In general, the value of the output of a machine is less than the value of the input because of the frictional force in the machine.

The greater the efficiency of the engine, the better the machine

Can be formulated :

`\tt E=(W_(out))/(W_(in))* 100\%`

w output = 190 J

W input = 200 J

The efficiency :

`\tt E=(190)/(200)* 100\%=95\%`