A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field . Due to the force q , its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are
respectively
1 m/s, 3.5 m/s
1 m/s , 3 m/s
2 m/s , 4 m/s
1.5 m/s , 3 m/s
As we have learned
2nd equation or Position- time equation -
Displacement
Initial velocity
acceleration
time
-
velocity increases from 0 to 6 m/s
velocity decreases from 6 to 0 m/s
but car continues to move forword
since acceleration is same
car's velocity increases from 0 to -6 m/s
Distance travelled in first second
Total displacement = 3m
Average velocity = 3/3 =1 m/s
Total Distance =(3+3+3)m =9m
Average speed =
Option 1)
1 m/s, 3.5 m/s
This is incorrect
Option 2)
1 m/s , 3 m/s
This is correct
Option 3)
2 m/s , 4 m/s
This is incorrect
Option 4)
1.5 m/s , 3 m/s
This is incorrect