Question

7. A porg (bird-like creature) has an acceleration of 1.2 m/s/s, to the right. The animal is moving at 0.8 m/s to the right. 5.0 seconds later, it is moving at 6.8 m/s to the right. Calculate the Rarg's average speed. For credit, show work in detail.

A) 0.4 m/s
B) 1.2 m/s
C) 3.6 m/s
D) 4.0 m/s

Answer 1

The average speed of the porg is 4.0 m/s. OPTION D

Step-by-step explanation:

To calculate the average speed, we use the formula:

Average Speed = Change in Distance / Change in Time

Given that the initial velocity (u) is 0.8 m/s, the final velocity (v) is 6.8 m/s, and the time interval (t) is 5.0 seconds, we can calculate the acceleration (a) using the kinematic equation:

v = u + at

Rearranging the equation to solve for a, we get:

a = (v - u) / t

Substitute the given values:

a = (6.8 m/s - 0.8 m/s) / 5.0 s = 1.2 m/s^2

Now, use the average speed formula:

Average Speed = Change in Velocity / Change in Time

Substitute the given values:

Average Speed = (6.8 m/s - 0.8 m/s) / 5.0 s = 4.0 m/s

Therefore, the correct answer is D) 4.0 m/s.