Worksheet :4
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1.A body moves with a speed of 10 ms due East. After 10 minutes, it moves with a speed of 5mg
-1
due West. The change in the velocity of the body during this time interval is
a)15 ms' due East
-1
b) 5 ms due East
c) 5 ms due West ) 15 ms due
West
А
2. In the above problem change in the speed of the body is
a) 5 ms-1
d) 15 ms
b)
c)- 5 ms!
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Answer:
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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