posted by Mark on .
A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 s. What is its acceleration?
acceleration= change in velocity/change in time
and the velocity= change in displacement /change in time
Velocity=28 m/ 11 s= 2.5 m/s
Acceleration=2.5/11= 0.23 m/s^2
Which is close to Letter A, so the answer is letter A...is this correct?
The velocity you calculated is the average velocity. The acceleration is the FINAL velocity divided by the time interval. Use instead X = (1/2) a t^2
28 = (1/2)a t^2 = (1/2)*a*121
a = 28*2/121 = 0.46 m/s^2