8. Ram jogs on a straight road from point A to B. The distance between A and B is 4 km. Now from point B he turn back and
jogs 2 Km to point C. Find the distance and displacement of the whole journey.
9. The odometer at the start of the trip reads 1600 m and at the end of the trip reads 2100 m. The trip journey took 10 hours. What
is the average speed in Km/h and m/s.
10. Jack jogs from point A to point B in 1 min 30 s. The distance between point A and B is 400 m. He then turns back and runs
200 m to point c in 30 secs, what is average velocity and speed from A to B and A to C.
Answers
8-distance =6m
displacement=2 m
9- total distance =2100-1600=500m=0.5 km
total time taken= 10hr=10×60×60=36000sec=36×10^3
average speed in km/hr
average speed=total distance /total time taken
=0.5/10=0.05km/hr
average speed in m/sec
average speed =total distance/total time taken
=500/36×10^3=13.8×10^-3 m/sec
10-total distance from A to B=400m
total distance from A to C =600 m
total displacement from A to B= 400 m
total displacement from A to C=200m
time taken from A to B=90sec
time taken A to C=120 sec
average velocity from A to B
average velocity =total displacement/total time taken
=400/90
=4.45 m/sec
average velocity from A to C
Average velocity=total displacement/total time taken
=200/120
=1.67m/sec
average speed from A to B
average speed =total distance /total time taken
=400/90
=4.45m/sec
Average speed from A to C
Average speed= total distance/total time taken
=600/120
=5m/sec.
Explanation:
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