Q21 of 24 Page 60

Using following data, draw time - displacement graph for a moving object:











Time (s)



0 2 4 6 8 10 12 14 16



Displacement (m)



2 4 4 4 6 4 2 0



Use this graph to find average velocity for first 4 s, for next 4 s and for last 6 s.

Average velocity =


Or V=1ms-1


For next 4s,



V = 0/4


V = 0 ms-1


As X(metre) remains the same from 4 to 8 seconds, velocity = 0


For last 6s,


V=


V = -6/6


V = -1ms-1


More from this chapter

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19

An object is dropped from rest at a height of 150 m and simultaneously another object is dropped from rest at a height 100 m. What is the difference in their heights after 2 s if both the objects drop with same accelerations? How does the difference in heights vary with time?

 20

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

 22

An electron moving with a velocity of 5×104 m s-1 enters into a uniform electric field and acquires a uniform acceleration of 104 m s–2 in the direction of its initial motion.

(i) Calculate the time in which the electron would acquire a velocity double of its initial velocity.


(ii) How much distance the electron would cover in this time?

 23

Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between 4th and 5th seconds.