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+1 vote
42.9k views
in Physics by (150k points)

A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field vector E. Due to the force q vector E, its velocity increases from 0 to 6m/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) 2m/s, 4m/s 

(2) 1m/s, 3m/s 

(3) 1m/s, 3.5 m/s 

(4) 1.5m/s, 3m/s

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1 Answer

+2 votes
by (87.2k points)
edited by

0 < t < 1s : velocity increases from 0 to 6m/s 1 < t < 2s : velocity decreases from 6 to 0m/s but car continues to move forward 2 < t < 3s : since field strength is same 

=> same acceleration 

∴ car's velocity increases from 0 to –6m/s

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