Suppose a car travels 20 meter in first 15 seconds, 40 meter in next 15 seconds and 10 meters in yet next 15 seconds find it’s speed after first 15 seconds, next 15 seconds and in yet next 15 seconds.
Answers
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Given : a car travels 20 meter in first 15 seconds,
40 meter in next 15 seconds
10 meters in the next 15 seconds
To Find : Speed after 15 seconds,
next 15 seconds and
in the next 15 seconds.
Solution:
Speed = Distance / time
Speed in first 15 secs = 20/15 = 4/3 = 1.333 m/s
Speed in next 15 secs = 40/15 = 8/3 = 2.667 m/s
Speed in last 15 secs = 10/15 = 2/3 = 0.667 m/s
Speed in first 30 secs = (20 + 40)/(15 + 15) = 2 m/s
Speed in last 30 sec = (40 + 10)/(15 + 15) = 50/30 = 5/3 = 1.667 m/s
Speed in total 45 sec = (20 + 40 + 10)/(15 + 15 + 15) = 70/45 = 14/9 m/s
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