A car is moving along a straight path between points O and B. The record of motion is as follows: Stage 1 (OA): The car was travelling at 10 m/s when it reaches point O and then brakes with a constant acceleration of -2 m/s? for 21 meters. Stage 2 (AB): The car travels 10 m during 2 seconds. If the average velocity of the car during the whole trip is 6.2 m/s, then what would be the time elapsed in stage 1? vo = 10 m/s A В a) 1 s b) 2 s a1 = -2 m/s? LAB = 2 s OA = 21 m AB = 10 m

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Chapter2: Kinematics
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Problem 30CQ: Consider the velocity vs. time graph of a person in an elevator shown in Figure 2.58. Suppose the...
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A car is moving along a straight path between points O and B. The record
of motion is as follows:
Stage 1 (OA): The car was travelling at 10 m/s when it reaches point O and
then brakes with a constant acceleration of -2 m/s? for 21 meters.
Stage 2 (AB): The car travels 10 m during 2 seconds.
If the average velocity of the car during the whole trip is 6.2 m/s, then
what would be the time elapsed in stage 1?
vo = 10 m/s
A
B
a) 1 s
b) 2 s
c) 3 s
d) 4 s
e) 5 s
a1 = -2 m/s?
OA = 21 m
LAB = 2 s
AB = 10 m
Transcribed Image Text:A car is moving along a straight path between points O and B. The record of motion is as follows: Stage 1 (OA): The car was travelling at 10 m/s when it reaches point O and then brakes with a constant acceleration of -2 m/s? for 21 meters. Stage 2 (AB): The car travels 10 m during 2 seconds. If the average velocity of the car during the whole trip is 6.2 m/s, then what would be the time elapsed in stage 1? vo = 10 m/s A B a) 1 s b) 2 s c) 3 s d) 4 s e) 5 s a1 = -2 m/s? OA = 21 m LAB = 2 s AB = 10 m
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