Một vật trượt từ đỉnh mặt phẳng nghiêng xuống chân dốc . Biết rằng gốc giữa mặt phẳng nghiêng và mặt phẳng ngang là 30°. Gia tốc trọng trường g=10m/s. hệ số ma sát giữa vật và mặt phẳng nghiêng là 0.2. gia tốc vật trượt xuống là

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.

Answer///air resistance,drag;