Sam pulls Frodo (who has a mass of 40 kg) across the ground with a force of 10 N. If the friction between Frodo and the ground is 7 N, what is Frodo's acceleration? 0.075 m/s2
0.425 m/s2
120 m/s2
680 m/s2

The third hammer 8 pounds

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.

Independent variable is something that is changed in a experiment.