A classical mechanics problem by Tammu Triveni

Classical Mechanics Level 2

A car starts from the rest with a constant acceleration of 4 m/s^2. Determine the distance travelled in the 7 th second?


The answer is 26.

Tammu Triveni by Tammu Triveni , 26, India

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1 solution

Tammu Triveni
Aug 27, 2014

Given u=0; a= 4 m/s^{2} Using S= ut+(at^{2})/2, Distance travelled in 7th second is given by S=98 m. Distance travelled in 6 ht second is given by S=72 m. Therefore distance travelled in 7 th second = 98-72=26.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

26 m. is the distance traveled from 6th sec to 7th sec. Your question is the distance traveled up to 7th sec.It is understood that the initial time is the resting time so the correct answer must be 98

Bryle Navarro - 6 years, 7 months ago

There is no distance travelled if you say "in the 7th second", because 7th second is a point of time. At a point of time you will only get a position, not a distance. You can only get a distance in an interval of time. You should ask for "the distance travelled between 6th to 7th second".

Sorry for the bad grammar

Andronikus Lumembang - 6 years, 5 months ago

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