Question

Compute your average velocity in the following ase:
(a) You walk 78.8 m at a speed of 1.91 m/s and then run 78.8 m at a speed of 3.57 m/s along a straight track.

Answer 1

you should find the time of walking in two stages and add them .
v=d/t
1.91=78.8/t1
t1=78.8/1.91=41.2 s
v=d/t
3.57=78.8/t2
t2=78.8/3.57=22.07s
t=t1+t2=41.2+22.07=63.27 s