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A car traveling west in a straight line on a highway decreases its speed from 30 meters per second to 23 meters per second in 2 seconds. The car's average acceleration during this time interval is
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A car traveling west in a straight line on a highway decreases its speed from 30 meters per second to 23 meters per second in 2 seconds. The car's average acceleration during this time interval is

User Mithun Biswas
by
6.8k points

2 Answers

3 votes
Use the equation Vf=Vi+A(t)
Rearrange it so A is isolated: A= Vf-Vi/t
A=(23-30)/2
A=-3.5m/s^2
User Ombk
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8.2k points
2 votes
u1= 30m/s
u2= 23m/s
t=2s
a=(u2-u1)/t
a=-7/2=-3.5 m/s^2
User Sergey Olontsev
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8.6k points
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