# Find the time taken by the truck to move ##1## metre.

• chwala
chwala
Gold Member
Homework Statement
See attached.
Relevant Equations
kinematics
Unless i am missing something; there is an error with the textbook

It ought to be ,

## t= \sqrt {\dfrac{1}{0.04}}= \sqrt 25 = 5## seconds.

Why ?

chwala
chwala said:
Homework Statement: See attached.
Relevant Equations: kinematics

Unless i am missing something; there is an error with the textbook

View attachment 339804

It ought to be ,

## t= \sqrt {\dfrac{1}{0.04}}= \sqrt 25 = 5## seconds.

If $u = 0$ then $$s = \tfrac12 at^2 \quad \Rightarrow \quad t = \sqrt{\frac{2s}{a}}$$ as the textbook has, not $t = \sqrt{s/a}$ as you are suggesting.

chwala
pasmith said:
If $u = 0$ then $$s = \tfrac12 at^2 \quad \Rightarrow \quad t = \sqrt{\frac{2s}{a}}$$ as the textbook has, not $t = \sqrt{s/a}$ as you are suggesting.
Let me take a break! Cheers @pasmith

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