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The graph given alongside shows how the speed of a car changes with time:

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26/10/2021 6:06 pm

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figure.png

(i) What is the initial speed of the car?

(ii) What is the maximum speed attained by the car?

(iii) Which part of the graph shows zero acceleration?

(iv) Which part of the graph shows varying retardation?

(v) Find the distance travelled in first 8 hours.

BidishaKashayap1333

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class 9 motion lakhmir singh

1 Answer

26/10/2021 6:08 pm

(i) Initial speed of the car =10km/h

(ii) Maximum speed attained by the car = 35km/h

(iii) BC represents zero acceleration.

(iv) CD represents varying retardation.

(v) figure.png

Distance travelled in first 8 hrs:

s = Area of trapezium OABF + Area of rectangles BCEF

= \(\frac{1}{2}\) x (OA + BF) x OF + BF x FE

= \(\frac{1}{2}\) x (10 + 35) x 3 + (35 x 5)

= 67.5 + 175

= 242.5 km

This post was modified 8 months ago by Mayank1444

Mayank1444

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The graph given alongside shows how the speed of a car changes with time:

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