Simple two part physics problem

Physics
Tutor: None Selected Time limit: 1 Day

A sprinter explodes out of the starting block with an acceleration of +3.3 m/s2, which she sustains for 1.1 s. Then, her acceleration drops to zero for the rest of the race.

(a) What is her velocity at t = 1.1 s?

(b) What is her velocity at the end of the race?

Aug 24th, 2015

Thank you for the opportunity to help you with your question!

Think about the two components of her travel distance 1) in cart = +3.3m/s while walking 1.1*t (t=unknown time that we wish to solve) Then the total distance which can be expressed as the total time(1.1)*ave speed. Equate the two, and solve for t

Please let me know if you need any clarification. I'm always happy to answer your questions.
Aug 24th, 2015

Could you explain part 1 a little more? I should set part 1 equal to part 2?

So it should be 3.3+1.1t=3.63?

Aug 24th, 2015

Nevermind, I got it. Since velocity does not change after 1.1s, it is the same from 1.1s onward.

Aug 24th, 2015

Thank you!

Aug 24th, 2015

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