Three charges are arranged as shown in the diagram. -8 μο
The magnitude of the net electrical force acting on the +6
charge, rounded to the tenths place, is
N.
0.3 m
0.2 m
+6 μC
0.2 m
0.2 m
-0.3 m
-5 uc

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.

Sorry i don’t know what to do

Repeated trials allow you to calculate a mean which can reduce the effect of random errors to make your results more precise.your results will also be reproducible therefore if someone else did the same experiment they'd get the same results which would make your results more reliable.