Question

A fly travels at 23 m/s to the north. It has an acceleration of 3 m/?to the south for a duration of 18 seconds.

What is the final velocity of the fly?

Answer 1

31 m/s south

Step-by-step explanation:

Since the acceleration, a, is to the south (opposite the initial direction of motion), the sign is negative (-).

Let north be + positive direction and south be - negative direction

a = (Vf - Vi) / Δt

a = - 3 m/s²

Vf = ?

Vi = 23 m/s north

- 3 m/s² = (Vf - 23 m/s) / 18 s solve for Vf

Vf = (- 3 m/s²)(18 s) + 23 m/s = -31 m/s meaning, it was going south