A car travels A to B in 10 seconds with a speed of 54 km per hour and returns in 5 second. Find the average,speed and velocity for the whole journey?Full solutions and Explanation.
Answers
av . speed = total distance/total time here in first case car travel A to B in 10sec with the speed of 54 km/hr (54×5/18 = 15 m/sec) , distance between A to B is S= v×t , S = 15× 10 means S is 150 m and then it returns back to its original position A in 5 sec then av.speed = 150+150/10+5 , av.speed= 300/15, av.speed = 20m/sec , av. velocity= total displacement/total time but the car travel A to B and then B to A means total displacement is zero so av. velocity is zero
Averag speed
= total distance/total time
Converting km/h to m/s by just multiplying 5/18
As 1km/h = 1×1000m/(60*60)s
=5/18 m/s
Distance from A to B = vt
= 54kmph × 10s
= 54×5/18 (m/s) × 10
= 150m
Average speed = 150 ×2/(10+5)
= 20m/s
=20× 18/5
= 72km/h
Average velocity =
total displacement/time
As the initial and final position is same the total displacement =0
Average velocity =0
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