What is the acceleration of a car with a final velocity of 25 m/s if the initial velocity was 1 m/s and it takes 6 seconds? a = (Vf - Vi)
Δt
a 150 m/s2
b 4 m/s2
c – 4 m/s2
d 32 m/s2

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.

What is meant to happen is

Then you have too divide it  by 2