Physics problem for school plz help?
Okay so im a little confused here with what formula to use with this problem. A car is travelling at 26 miles per hour after 2 hours it had travelled a distance of 60 miles what is its acceleration.
First formula
S=ut+1/2at^2
Useing (rearrange) that formula i get the answer 4
Second formula(s)
S=d/t
V-u/t=a
Rearranging the forumla i find speed of the car (60/2) and then i use that to find the acceleration however this gives me a answere of 2 how is this even possible this is really confusing me. Isnt both of the formulas meant to give me the same answere?
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Answers & Comments
First formula: S=ut+1/2at^2 is correct one to use to get the acceleration, which is:
a = 4 miles/hour²
We don't initially have a value for V so can't use:
V = u + at
to work out acceleration. However, now we know that a=4 we can calculate V:
V = 26 + 4*2 = 34 miles/hour.
Now we have all the suvat values you can use whatever equation you please.