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9. Molly, a stray dog in the city, runs one complete lap around the base a building
in exactly 10.0 minutes. The building has a rectangular base with dimensions 132
meters by 153 meters. Find Molly's (a) total distance, (b) total displacement, (c)
average speed, and (d) average velocity.

Answer :

Explanation:

a) THE TOTAL DISTANCE IS THE PERIMETER OF THE RECTANGULAR BASE

=> P= 2(L + B) = 2(153 +132)= 570 M

b) SINCE THE DOG(MOLLY) RAN A COMPLETE LAP— MEANING SHE WENT RIGHT BACK WHERE SHE STARTED THE DISPLACEMENT IS ZERO

c) speed(ave)= total distance/ time

=> Speed(ave)= 570/(10×60) =0.95m/s

RECALL THAT TIME HS TO BE IN SECONDS.

d) SINCE VELOCITY IS THE RATE OF CHANGE OF DISPLACEMENT

i.e V = displacement / time.

WE KNOW THAT DISPLACEMENT IS ZERO HENCE VELOCITY IS ALSO ZERO

V =0/(10×60) =0 m/s

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