Question

?

Answer 1

mechanical advantage = output/input where the input is the force the person is pulling with and the output is the force the pulley applies onto the box

Answer 2

6.7

Answer 3

good

for ii) the efficiency of 78% just means that 78% of 775 J is being done, so 78% of 775 = 604.5 J = your answer

Answer 4

is there a unit for i

Answer 5

no, mechanical advantage is dimensionless

Answer 6

okay thanksss