Question

Sandra moves 14 m in 2 minutes. What is Sandra’s average velocity?

1.98 m/s
0.23 m/s
0.78 m/s
2.56 m/s

Please help.

Answer 1

Sandra’s average velocity is 0.1166 m/s

Step-by-step explanation:

Velocity is a vector quantity and it is defined as the rate of change in displacement with respect to time. So ratio of displacement to time taken for that displacement or distance covered will give the magnitude of velocity.

Average velocity is defined as the average of different velocities exhibited by the object to cover different distances in different time intervals. As here only one distance and one time interval is given, average velocity of Sandra will be equal to the magnitude of velocity of Sandra.

So as Sandra moves 14 m distance in 2 m time, the velocity is

`\text {Average velocity }=\text {Magnitude of Velocity}=\frac{\text {Distance}}{\text {Time}}`

As the time is given in the units of minute, it should be converted to seconds. So the next step will be

`\text { Average Velocity }=\frac{14 \mathrm{m}}{2 * 60 \mathrm{s}}` = 0.1166 m/s

Answer 2

Given that,

Distance, s = 14 m

Time, t = 2 minutes = 2*60 = 120 s

Velocity = ?

Since, we know that,

Velocity = Distance / time

V = s/t

V = 14/ 120

V= 0.11667 m/s

The average velocity of Sandra will be 0.11667 m/s