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.)

Question

bobpursley · Answer

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

Damon · Answer

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