Question

Compute your average velocity in the following two cases (a)you walk 73.2m at a speed of 1.22m/s and then run 73.2m at a speed of 3.05m/s a long a straight track. (B)you walk for 1min at a speed of 1.22m/s and then run for 1 min at 3.05 m/s a long a straight track. (C) graph x versus t for both cases and indicate how the average velocity is found on the graph.

Answer 1

Answer:

For part (a); 1.74 m/s

For part (b); 2.135 m/s

For part (c); graphically gradient of the graph gives us the velocity

Explanation:

Formula for average velocity = Total distance covered / total time

For part (a);

We first calculate the time for each interval;

T1 = 73.2 / 1.22 = 60 sec

T2 = 73.2 / 3.05 = 24 sec

Average velocity = ( 73.2 + 73.2) / (60 + 24)

Average velocity = 1.74 m/s

For part (b);

We first calculate the distance for each interval;

D1 = 1.22 x 60 = 73.2 m

D2 =  3.05 x 60 = 183 m

Average velocity = ( 73.2 + 183) / (60 + 60)

Average velocity = 2.135 m/s