The speed of a car is increased continu-
ously from 10 m/s to 20 m/s in 1 minute. It
average speed is.
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Explanation:
Acceleration = Change in velocity / Time
= (20 m/s - 10 m/s) / 1 min
= 10 m/s / (1 min)
= 10 m/s / (60 s)
= 1/6 m/s²
Total distance covered during this period is:
S = (v² - u²)/(2a)
= (20² - 10²)/(2 × 1/6)
= 300 / (1/3)
= 900 m
Average speed = Total Distance / Total time
= 900 m / (1 min)
= 900 m / (60 s)
= 15 m/s
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Alternate method
Average speed = (v₁ + v₂) / 2
= (20 m/s + 10 m/s) / 2
= (30 m/s) / 2
= 15 m/s
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