Question

1. What is used to calculate the average speed for a journey?

2. A scooter travels 120 meters directly towards the East in 6 seconds, and then it travels 100 meters directly towards the North in 6 seconds, What is the average speed of the scooter?

3. The displacement of the scooter from its original starting position was 141 meters. What is the velocity of the scooter?

4. What are some ways that an object could be accelerating?

5. How are velocity and acceleration related? ​

Answer 1

1. Formula for average speed =total distance:total time

2. Average Speed =total distance/total time
Total distance =120+100=220
Total time =6+6=12
Therefore average speed =220/12
=18.3
3. Velocity =displacement/time
Displacement =141 time =12
Velocity =141/12
=11.75
4. Change in velocity
Change in direction
Change in both
5. Acceleration =velocity/time
And they are both vector quantities

Answer 2

1. Average speed is the ratio of total distance travelled to total time taken to cover that distance.

Explanation:average speed = total distance/ total time taken

2. Here, total distance traveled =220m

Total time taken= 6+6 = 12s

Average speed = 220/12 = 18.33 m/s

3. We know, velocity = displacement/time taken

i.e., v= 141/12 = 11.75 m/s

4. An object can accelerate by changing i) direction

ii) velocity

iii ) both velocity and
direction

5. Change in velocity with time is acceleration.
a = v/t