Question

An electric toy car moves 4 cm forward and 3 cm backward every minute, with each movement equally spaced in the 1-minute duration. How much time (in minutes) does it take for the toy car to cover 40 cm?


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Answer 1

Answer:

1 m/s ; 3.5 m/s

Explanation:

0 < t < 1s : Velocity increases from 0 to 6 m/s

1 < t < 2s : Velocity increases from 6 to 0 m/s but car continues to move forward

2 < t <3s : Since field strength is Same

∴ Car's velocity increases from 0 to -6 m/s

Distance traveled in 1st second

S=( 2u+v )t=( 20+6 )(1)=3mDistance=9m

So, Average speed = 3s/9m =3 m/s

Displacement =3m

So, Average velocity = 3s/3m =1 m/s.

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