5 A student investigates the motion of different falling masses by measuring the time taken for empty cupcake cases to fall from a window.
(a) The student drops one case from the window.
He repeats the experiment with two cases stuck together, then with three cases
and then with four.
Name two measuring instruments that he would need for his investigation.

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.

True.it is better to buy a washer with a higher efficiency rating

What even is this. where is the question