An Australian emu is running due north in a straight line at a. speed of 13.0 m/s and slows down to a speed of 10.6 m/s in 4.0 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?

Question

Ashley Hawkins

Physics

14 February, 11:14

An Australian emu is running due north in a straight line at a. speed of 13.0 m/s and slows down to a speed of 10.6 m/s in 4.0 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?

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Jamie Moody · Answer 1

The acceleration of the bird is the quotient obtained when the difference of its final and initial velocities is divided by the time elapsed.

a = (Vf - V1) / t

a = (10.6 m/s - 13 m/s) / 4 = - 0.6 m/s²

Thus, the acceleration is equal to - 0.6 m/s².

For the velocity after 2 seconds,

Vf2 = Vf1 + at

Substituting,

Vf2 = 10.6 m/s + (-0.6) x 2 = 9.4 m/s