Starting from rest, a particle confined to move along a straight line is accelerated at a rate of 4 m/s2. How long will it take for the particle to travel 200m?

10 seconds

Explanation:

Step one:

initial velocity= 0m/s

acceleration a= 4m/s^2

distance S= 200m

Step two:

from the equation of motion

S=ut+1/2at^2

substituting our data we have

200=0*t+1/2*4*t^2

200=2t^2

divide both sides by 2

100=t^2

square both sides

t=√100

t=10 seconds

it will take 10 seconds

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