Which of the two can be zero under certain conditions: average speed of a moving body or average velocity of a moving body?

Write the other name for
($\mathrm{i}$) Negative acceleration.

($\mathrm{ii}$) Non–uniform acceleration.

Manish was travelling from Delhi to Jaipur by his car for a meeting. He had to reach the destination in the given time. So, he kept a track of the odometer and his watch all through the journey to decide upon his speed. This helps him to reach on time for the meeting.
Read the above passage and answer the following questions:
(i) What measuring devices were used by Manish?

(ii) What qualities of Manish are worth appreciating?

(iii)Why did Manish measure the distance and time?

Raman and his sister Saniya go to school together in their car. Raman drives much faster than Saniya. Saniya tells Raman not to take the risk of over speeding. She tells him that time taken to reach the school would depend upon average speed. By overspending for a little while, the risk involved is much greater compared to the little time saved. Read the above passage and answer the following questions:
(i) Which values are displayed by Saniya?

(ii) Is Saniya right in her statement?

(iii) How do you define average speed?

A body travels a distance of $3 \mathrm{k}\mathrm{m}$ towards East, then $4 \mathrm{k}\mathrm{m}$ towards North and finally $9 \mathrm{k}\mathrm{m}$ towards East. What is the total distance travelled?

What is the resultant displacement?