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Question

A car travelled from city A to city B and returned back to city A in 30 minutes. The distance between city A and city B is 10 km. The average speed and average velocity of the car will be respectively (in m/s):


A
11.11, 0
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B
0, 11.11
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C
0, 0
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D
11.11, 11.11
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Solution

The correct option is A 11.11, 0

Total distance covered:
d=2×10 km
d=20000 m

Time taken:
t=30 min
t=30×60 s=1800 s

Average speed is given by:
<v>=dt
<v>=20000 m1800 s
<v>=11.11 m/s

Since the car returns to the initial position, displacement (s) is 0.
Average velocity is given by:
vavg=st=0


Physics

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