Question

The speed time graph for a car is shown is Fig.8.12
(A)Find how far does the car travel in the first four seconed shade the area of the graph that represents the distance travelled by the car during the period
(B)which part of the graph represent's uniform motion of the car?

Answer 1

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11th

Physics

Motion in a Straight Line

Speed and Velocity

The speed - time graph for ...

PHYSICS

The speed-time graph for a car is shown in Fig.

(a) Find how far does the car travel in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period.

(b) Which part of the graph represents uniform motion of the car?

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October 15, 2019

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Mirunalini Kousar

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ANSWER

(a)

The total number of divisions on horizontal axis for 2 s is 5.

The total number of divisions on vertical axis for 2 m/s is 3.

The total displacement of the car during these two seconds will be given as the area under all these squares.

The area under the (3×5) squares is given as:

A

15

=2×2 = 4

So, the area under one small square is :

A

1

=

15

4

Now, the area under the graph for 4 sec is:

the number of squares under the graph is :

n=57 small squares + 6 half small squares

So, total number of squares =60.

So, the distance traveled by the car is the area under the curve.

S=60×

15

4

S=16 m

(b)

The car moves under the uniform motion after the instant t=6 s because after this instant, the speed of the car becomes constant.

Explanation:

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