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GoGoGadget
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Homework Statement
An automobile travels in a straight line for 10 seconds at 20 m/s than accelerates uniformly to a speed of 30 m/s in the next 10 seconds. Find the total displacement.
Homework Equations
d = 1/2(v0+v)t
The Attempt at a Solution
v0 = 20 m/s
v = 30 m/s
t = t1 + t2 = 10 sec + 10 sec = 20 sec
d = 1/2 (20 + 30) (20)
d = 500 m
The answer key though says it should be 450 m and I'm not sure why that would be the case...