E posive at me t1 0 s a car is moving with velocity

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Unformatted text preview: object’s velocity is changing? Jan. 23, 2013 10 A car is ini%ally moving at +5 m/s. Five seconds later it is moving at +15 m/s. What is its average accelera%on? t1 = 0 s, v1 = 5 m/s A)  +5 m/s B)  +2 m/s C)  +2 m/s2 D) - 2 m/s2 E) - 5 m/s2 t2 = 5 s, v2 = 15 m/s Δv v2 − v1 (15 − 5 )m / s m a= = = = +2 2 Δt t 2 − t1 (5 − 0 )s s Accelera%on is to the right; i.e., posi%ve. At %me t1= 0 s, a car is moving with velocity - 15 m/s (to the lee). At later %me t2 = 5 s, the car is moving with velocity – 5 m/s. What is the direc%on/sign of accelera%on? Δv v2 − v1 (−5 − (−15))m / s m A)  Right and posi%ve. a= = = = +2 2 Δt t 2 − t1 (5 − 0 )s s B)  Lee and nega%ve. C)  There is no accelera%on. Note: the direc%on of accelera%on D)  Right and nega%ve. is not the d...
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This document was uploaded on 03/09/2014 for the course PHYSICS 2010 at Colorado.

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