Physics, asked by beant7556, 2 months ago

Answer please class 9 physics ​

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Answered by misbahulalamiyc
1

Answer:

Average speed = Total Distance / Total Time

S1 = 50 km/hr T1 = 0.5 hr

D1 = S1 x T1 = 50 x 0.5 = 25 km

S2 = 30 km/hr T2 = 0.26 hr

D2 = S2 x T2 = 30 x 0.26 = 7.8 km

S3 = 70 km/hr T3 = 0.76 hr

D3 = S3 x T3 = 70 x 0.76 = 53.2 km

Total Distance = D1 + D2 + D3 = 25 + 7.8 + 53.2

Total Distance = 86 km

Total Time = T1 + T2 + T3 = 0.5 + 0.26 + 0.76

Total Time = 1.52 hr

Average Speed = 86/1.52

Average Speed = 56.58 km/hr

Answered by shlokatomar
2

Answer:

The average speed of the car is roughly 54.29 km/hr.

Explanation:

Given:

  • Speed of the train for the first 30 minutes (0.5 hours) = 50 km/hr
  • Speed of the train for the next 15 minutes (0.25 hours) = 40 km/hr
  • Speed of the train for the next 60 minutes (1 hour) = 60 km/hr

To find:

The average speed of the car

Method to find:

First, we need to find the total distance covered by the train.

Distance = Speed * Time

Let the distance covered in the 3 time periods be d₁, d₂ and d₃.

d₁ = 50 km/hr * 0.5 hrs

d₁ = 25 km

d₂ = 40 km/hr * 0.25 hrs

d₂ = 10 km

d₃ = 60 km/hr * 1 hr

d₃ = 60 km

Total Distance Covered = d₁ + d₂ + d₃

⇒ Total Distance Covered = (25 + 10 + 60) km

Total Distance Covered = 95 km

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Now, we need to find the total time taken.

Total Time Taken = (0.5 + 0.25 + 1) hrs

⇒  Total Time Taken = 1.75 hrs

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With the above information, we can now find the average speed.

Average Speed = Total Distance / Total Time

⇒ Average Speed = 95 km / 1.75 hr

Average Speed = 54.2857142857 km/hr ≈ 54.29 km/hr

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Hope it helps!

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