A toy car with charge 
moves on a frictionless horizontal plane surface under the influence
of a uniform electric field 
. Due to the force 
, its velocity increases from 0 to 
in one second duration. At that instant, the direction of 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.
Text Solution
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; velocity increases from 0 to 
; velocity decreases from 6 to 
; since field strength is same
same acceleration.
Car's velocity increases from 0 to 
.
Distance travelled in first second
Distance 
, so average speed 
Displacement 
, so average velocity 
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