Physics- Acceleration

Physics
Tutor: None Selected Time limit: 1 Day

A car traveling with an initial velocity of -25 m/s changes velocity to -35 m/s in a time of 10.3s. Is the constant acceleration of the car positive or negative in this problem? Explain why. 

Jun 10th, 2015

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

intial velocity=-25m/s final velocity=-35m/s

time=10.3

acceletion=(final velocity-initial velocity)/time

=-10/10.3

=-0.9709m/s^2

deceleration =0.9709

the acceration is negative because the vehicle is decelarating

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 10th, 2015

how do we know that the car is deaccelerating if our accretion number that you got is positive? 

Jun 10th, 2015

the number i got acceration is negative -0.9709

this negative sign means it is decerating  when giving answers in decerating you do not include negative sign


Jun 10th, 2015

Oh i apologize i didn't see the negative sign. Thank you so much for the help. 

Jun 10th, 2015

Can you help me with a different question?

Jun 10th, 2015

yes

Jun 10th, 2015

A car traveling with an initial velocity of -25 m/s comes to a stop in a time of 6.3s. Is the constant acceleration of the car positive or negative in this problem? Explain why. 

Jun 10th, 2015

when the car comes to rest its final velocity  will be zero

acceleration=change in velocity/time

a=(0--25)/6.3

=4.167m/s^2

the acceleration  is by positive because negative multiply negative is a positive

best me my friend 

Jun 10th, 2015

Thank you so much! I really appreciate it 

Jun 10th, 2015

you re welcomed happy to serve you if you have even questions in mathematic feel free to ask

Jun 10th, 2015

please rate my work

Jun 10th, 2015

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