Question

During which time interval was the motion fastest?

Answer 1

The answer is not 1 to 2 I took the test and got it wrong ... it’s 4 to 5

Answer 2

Answer : The correct option is, 1 hr to 2 hr

Explanation :

Velocity : Velocity is defined as the rate of change of position of an object with respect to the time. It is a vector quantity that means it tell us about the magnitude and direction of an object.

Formula used :

`Velocity=(Displacement)/(Time)`

To calculate the velocity for time interval 0 to 2 hr:

`Velocity=((15-0)km)/((2-0)hr)=7.5km/hr`

To calculate the velocity for time interval 2 to 4 hr:

`Velocity=((20-15)km)/((4-2)hr)=2.5km/hr`

To calculate the velocity for time interval 4 to 5 hr:

`Velocity=-((20-0)km)/((5-4)hr)=-20km/hr`

From this we conclude that, at time interval 0 to 2 hr the motion will be fastest.

Hence, the correct option is, 1 hr to 2 hr