##### A car is initially moving at 20 m/s east, and a little while later it is moving

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A car is initially moving at 20 m/s east, and a little while later it is moving at 10 m/s north. Which of the following best describes the orientation of the average acceleration during this time interval?

 a. northeast b. west c. north of west d. northwest
Jun 18th, 2015

Conceptually speaking the direction of change in velocity, which will also be direction of average acceleration must have component along West to neutralize its motion along east and must also have component along North in order to finally move in that direction. Mathematically draw the initial, V1 and final vector, V2. Apply Triangle law of addition/subtraction to get the direction of the vector, V2 - V1 and see that it has direction of tan^-1( 2) = 63.4 degree,. Please note that average acceleration = (V2 - V1)/t, where t is time interval.

something has to stop it going east, so the a is west and to go north you need an a value north

Jun 18th, 2015

Jun 18th, 2015

northwest

Jun 18th, 2015

are you sure?

Jun 18th, 2015

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Jun 18th, 2015
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Jun 18th, 2015
Dec 11th, 2016
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