An electromagnetic wave traveling in a
vacuum has a wavelength of 2m.
Calculate the frequency of this wave.
The speed of light in a vacuum is c.
a) 1.5 x 108 Hz
b) 6.7 x 10-'HZ
c) 6.7Hz
d) 1.5 Hz

1. may 2. september 3. february, and december4. 70°f

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared. 

1. electricity2. discharge: )

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.