Physics, asked by Anonymous, 9 months ago

Please help me finding the explanation.... Answers are given....
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Answered by VishnuPriya2801

Answer:-

1) Given:

Initial velocity (u) = 0 km/h

Final Velocity (v) = 40 km/h

Time taken (t) = 10 s

We know that,

$acceleration(a) = \frac{v - u}{t} \\ \\ a = \frac{40 - 0}{ \frac{10}{3600} } \\ \\ a = \frac{40 \times 3600}{10} \\ \\ a = 14400 \: {km.h}^{ - 2} \\ \\ a = 1.11 \: {m.s}^{ - 2}$

2) Initial velocity = 60 km/h = (60*5)/18 = 16.66 m/s

Final Velocity = 0 km/h = 0 m/s

Time taken = 20 s

$a = \frac{0 - 16.66}{20} \\ \\ a = 0.83 \: {m.s}^{ - 2}$

3) Retardation = 2 m/s²

acceleration = - 2 m/s²

Final Velocity = 0 m/s

Time taken = 10 s

$- 2 = \frac{0 - u}{10} \\ \\ - u = - 2(10) \\ \\ u = 20 \: {m.s}^{ - 2}$

4) Initial velocity = 54 km/h = 15 m/s

Final Velocity = 72 km/h = 20 m/s

Time taken = 15 s

$a = \frac{20 - 15}{1 5 } \\ \\ a = \frac{5}{15} \\ \\ a = 0.33 \: {m.s}^{ - 2}$

Answered by NewBornTigerYT

Answer:

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For a journey from A to B avg. Speed is 20km/h and from B to A is 40km/h .calculate avg. Speed of entire journey.

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