- #1
Goopy17
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Homework Statement
A car is initial at rest. It accelerates over a distance of 1250m and reaches a speed of 112 km/h. Find: A) the acceleration for the car B) the time it took for it to reach this final speed C) the average speed
Homework Equations
A = delta V/ delta T or v^2 = V (initial)^2 + 2a (d -d(initial))
d = d(initial) + vt
The Attempt at a Solution
1250 = 0 + 31.1(t)
t = 40.18
A = 31.1/40.18
A = .77 m/s^2
BUT here is the problem
if i use v^2 = V (initial)^2 + 2a (d -d(initial))
31.1^2 = 0^2 + 2a(1250)
A = .387 m/s^2
that is half of the first one?
that is where i need help
Thanks!