Help with Homework Problem on Acceleration

[shawonna23]

The land speed record of 13.9 m/s (31 mi/h) for birds is held by the Australian emu. An emu running due south in a straight line at this speed slows down to a speed of 10.5 m/s in 2.7 s.

What is the direction of the bird's acceleration?

Assuming that the acceleration remains the same, what is the bird's velocity after an additional 3.9 s has elapsed?

[needhelpperson]

The land speed record of 13.9 m/s (31 mi/h) for birds is held by the Australian emu. An emu running due south in a straight line at this speed slows down to a speed of 10.5 m/s in 2.7 s.

What is the direction of the bird's acceleration?

Assuming that the acceleration remains the same, what is the bird's velocity after an additional 3.9 s has elapsed?

direction of bird's acceleration: Well obviously it's not due south, otherwise it would be accelerating. Hmm i wonder....

10.5 = 13.9 + a(2.7)

a = - (3.4/2.7)m/s^2<------------ what do you think the negative sign signifies?

for the second part. Just use vf = vi + at