An object travels North at 7 m/s for 6 s and then travels South at 3 m/s for 8 s. What are the object's average speed and velocity?

1 Answer
P dilip_k
Apr 30, 2016

Speed=33/7m/sand velocity =9/7m/s

Explanation:

Distance traveled due North in 6s @ 7m/s is =7xx6=42m
Distance traveled due South in 8s @ 3m/s is =3xx8=24m
Total Distance traveled =42m+24m=66m
Total time taken = 6+8=14s
So average speed =(Total Distance )/( time)=66/14m/s=33/7m/s

Now net displacement due North=42-24=18m (North,South being oppositely directed)

Hence Average velocity due North=(Displacement )/(Time)=18/14m/s=9/7m/s

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