A body moves with a speed of 10 m/s due east. After 10 minutes, it moves with a speed of 5m/s due west. The change in velocity of the body during this time interval is
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Explanation:
Average velocity =
Total distance travelled/total time taken
Distance = velocity×time
Total distance =
10×10+40×20
= 100+ 800 = 900 m
total time = 40+10 = 50 s
average velocity =
= 900/50
= 90/5 = 18 m/s
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