Question

Test yourself 30th s 10 R 1 Alongside is a speed-time graph for a car travelling along a straight road. a) What is the average speed of the car Q 3.0 between points 30 i) P and Q? ii) Q and R? 30 20 iii) R and S? b) What is the car's maximum speed? 30 10 c) For how many seconds is the car Р moving? 25 0 5 10 15 20 2 d) For how many seconds is the car Time in seconds moving at a constant speed? 10 e) How much speed does the car gain in the first 10 seconds? 30 f) How much speed does the car lose in the last 5 seconds? 30 Speed in m/s​

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Class 11

>>Physics

>>Motion in a Straight Line

>>Speed and Velocity

>>A car is moving along a str...

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A car is moving along a straight road at a steady speed. It travels 150 m in 5 seconds :

(a) What is its average speed?

(b) How far does it travel in 1 second?

(c) How far does it travel in 6 seconds?

(d) How long does it take to travel 240 m?

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Solution

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(a) Averape speed, v

av

=

Total time taken

Total distance travelled

=

5

150

=30 m/s

(b) Time =1s

Distance =V

av

×time=30×1=30 m/s

(c) Time =6s

Distance =v

av

×time=30×6=180 m/s

(d) Distance =240 m

Time=

V

av

Distance

=

30

240

=8s