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

  • #1
chwala
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Homework Statement
See attached.
Relevant Equations
kinematics
Unless i am missing something; there is an error with the textbook

1707127143855.png


It ought to be ,

## t= \sqrt {\dfrac{1}{0.04}}= \sqrt 25 = 5## seconds.
 
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  • #2
Why ?
 
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  • #3
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 [itex]u = 0[/itex] then [tex]s = \tfrac12 at^2 \quad \Rightarrow \quad t = \sqrt{\frac{2s}{a}}[/tex] as the textbook has, not [itex]t = \sqrt{s/a}[/itex] as you are suggesting.
 
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  • #4
pasmith said:
If [itex]u = 0[/itex] then [tex]s = \tfrac12 at^2 \quad \Rightarrow \quad t = \sqrt{\frac{2s}{a}}[/tex] as the textbook has, not [itex]t = \sqrt{s/a}[/itex] as you are suggesting.
Let me take a break! Cheers @pasmith
 
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