Motion | Motion - Intext Questions-5

Question 5

CHAPTERS

1. Matter in Our Surroundings

2. Is Matter Around Us Pure

3. Atoms and Molecules

4. Structure of the Atom

5. The Fundamental Unit of Life

6. Tissues

7. Diversity in Living Organisms

8. Motion

9. Force and Laws of Motion

10. Gravitation

11. Work and Energy

12. Sound

13. Why Do We Fall ill

14. Natural Resources

15. Improvement in Food Resources

EXERCISES

1. Motion - Intext Questions-1

2. Motion - Intext Questions-2

3. Motion - Intext Questions-3

4. Motion - Intext Questions-4

5. Motion - Intext Questions-5

6. Exercises

A bus starting from rest moves with a uniform acceleration of 0.1 m. $s^{-2}$

Time = 2 minutes = 120 s

Acceleration is given by the equation $a=\frac{v-u}{t}$

Therefore, terminal velocity (v) = (𝑎𝑡) + u

$\begin{array}{l} =\left(0.1 \mathrm{m} \cdot \mathrm{s}^{-2} * 120 \mathrm{s}\right)+0 \mathrm{m} \cdot \mathrm{s}^{-1} \\ =12 \mathrm{m} \cdot \mathrm{s}^{-1}+0 \mathrm{m} \cdot \mathrm{s}^{-1} \end{array}$

Therefore, terminal velocity (v) = 12m/s

(b) As per the third motion equation,

$2 a s=v^{2}-u^{2}$

Since $a=0.1 \mathrm{m} \cdot \mathrm{s}^{-2}, \mathrm{v}=12 \mathrm{m} \cdot \mathrm{s}^{-1}, \mathrm{u}=0 \mathrm{m} \cdot \mathrm{s}^{-1}$ and t = 120s, the following value for s (distance) can be obtained.

Distance $\mathrm{s}=\frac{v^{2}-u^{2}}{2 a}$

$=\frac{12^{2}-0^{2}}{2(0.1)}$

Therefore, s = 720m.

The speed acquired is 12m. $s^{-1}$ and the total distance traveled is 720m.