Answer:
40
Explanation:
Mechanical advantage = effort arm / load arm
MA = 20 cm / 0.5 cm
MA = 40
The reason scientists use light years instead of kilometres is becasue a light year is the distance traveled by light in one year, and if we actually did the math (ill just give it to you)

to put that into perspective a kilometer is 1000 meters or

. if they mesured everything in kilometers they would have to use even bigger numbers than they already do.
Could have gotten tired after the first trial. ? i’m not sure if that’s it
D. The new electric potential energy is 1/2as strong as the original
electric potential energy.