Q30 of 47 Page 8

Study the velocity-time graph and calculate.


(i) the acceleration from A to B.


(ii) the acceleration from B to C.


(iii) the distance covered in the region ABE.


(iv) the average velocity from C to D.


(v) the distance covered in the region BCFE.

(i) Acceleration from A to B = = = 8.33 m/s2
(ii) Acceleration from B to C = = -10 m/s2

(iii) Distance covered in the region ABE = × base × height


= × 3s × 25 m/s


= 37.5 m


(iv) Average velocity from C to D =


= = 7.5 m/s


(v) Distance covered in the region BCFE = × sum of parallel sides x distance between them = × ( 25+15) × 1 = 20 m

More from this chapter

All 47 →
26

A car is moving on a straight road with a uniform acceleration. The following table gives the speed of the car at various instants of time.


(i) Draw the shape of speed-time graph representing the above sets of observations.


(ii)Find the acceleration of the car.

 27

An object starting from rest travels 20 m in the first 2s and 160 m in next 4s. What will be the velocity after 7s from the start?

 28

(i) If the velocity-time graph of an object is parallel to X-axis, then what does it mean? Can it be parallel to Y-axis?

(ii) What type of motion is represented by each one of the following graphs?



(iii) A bus increases its speed from 36 km/h to 54 km/h in 10 s. Find its acceleration.

 29

Figure shows the distance-time graphs of three objects A, B and C. Study the graphs and answer the following questions:

(a) Which of the three is traveling the fastest?


(b) Are all three ever at the same point on the road?


(c) How far has C travelled when B passes A?


(d) How far has B travelled by the time it passes C?