Question

The speed of a car is increased continu-
ously from 10 m/s to 20 m/s in 1 minute. It
average speed is.​

Answer 1

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