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A man walks 7km east in 2 hours and then 2km east in 1 hour
a. What is the man's speed for the whole journey?
b. What is the man's velocity for the whole journey? with formula


Sagot :

Answer:

a. average speed is given by:

the total distance traveled/ total time taken

= (7+2.5)km/(2+1)hrs =9.5/3km/hr

=3.1667 km/hr

b. average velocity is given by:

displacement/ total time

displacement is 7km-2.5km= 4.5km

(since he walked 2.5km in the opposite of his initial direction)

Therefore average velocity= 4.5/ (2+1)

=4.5/3

=1.5 km/hr