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NCERT Class - 9 Science Solutions: Chapter 8 - Motion Part 5
Question 20:
An object starting from rest travels in first and in next . What will be the velocity after from the start?
Answer:
Since acceleration is the same, we have
Question 21:
Using following data, draw time - displacement graph for a moving object:
Time (s) | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 |
---|---|---|---|---|---|---|---|---|---|
Displacement (m) | 0 | 2 | 4 | 4 | 4 | 6 | 4 | 2 | 0 |
Use this graph to find average velocity for first , for next and for last .
Answer:
Average velocity for first 4 s.
For next 4 s
(or as x remains the same from 4 to 8 seconds, velocity is zero)
For last 6 s
Question 22:
An electron moving with a velocity of enters into a uniform electric field and acquires a uniform acceleration of in the direction of its initial motion.
- Calculate the time in which the electron would acquire a velocity double of its initial velocity.
- How much distance the electron would cover in this time?
Answer:
Given initial velocity
And acceleration
- Final velocity
To find
- Using