Asked by Sam

An Australian emu is running due west in a straight line at a speed of 12.8 m/s and slows down to a speed of 7.7 m/s in 7.4 s. (a) What is the direction of the bird’s acceleration? (b) Assuming that the acceleration remains the same, what is the bird’s velocity after an additional 2.0 s has elapsed? (Assume that due west is the positive direction. Indicate the direction with the sign of your answer.)
Answered by bobpursley
a. if it slowed, the acceleration is opposite the velocity
b. vf=vi+at
vf=7.7-((7.7-12.8)/7.4 )* 2.0

+ answer means west, negative means E
Answered by Damon
a
east

b
v = Vi + a t = 12.8 -(7.7/7.4)9.4