Question

An object moves, along a line,from point A to B to C and then back to B

again as shown in the figure below in half an hour.
a) find the average speed of the moving object in km/hr.
b) find the magnitude of the average velocity of the object in km/hr​

help me pleaseddddd!!!​

Answer 1

mark as brain list answer

Answer 2

a). Average speed = 26 km per hour

b). Average velocity = 10 km per hour

Step-by-step explanation:

a). Distance between A to B = 5 km

Distance between B to C = 4 km

Total distance traveled between A to B to C and then back to B

= 5 + 4 + 4

= 13 km

Time taken to cover this distance of 13 km =
`(1)/(2)` an hour

Therefore, average speed during this trip =
`(13)/((1)/(2))`

= 26 km per hour

b). Average velocity =
`\frac{\text{Displacement}}{\text{Duration}}`

Displacement = (Distance between A to B) + (Distance traveled between B to C) - (Distance traveled from C to B)

= 5 + 4 - 4

= 5 km towards A

Average velocity =
`(5)/((1)/(2))`

= 10 km per hour