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A car moving at a speed of 1.2 m/s undergoes a uniform de-acceleration of −0.4 m/s2 because of a red light. How far has the car moved 4 seconds after being applied the de-accelaration?

Question
A car moving at a speed of 1.2 m/s undergoes a uniform de-acceleration of −0.4 m/s2 because of a red light. How far has the car moved 4 seconds after being applied the de-accelaration?
check_circleAnswer
Step 1

The distance travelled by the car during reaction time is,

Substitute the values,

d vt
d(1.2m/s)(4s)
-4.8m
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d vt d(1.2m/s)(4s) -4.8m

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Step 2

According to the kinematics equation,

Substitute the values,

2-u22as
2a
(Om/)(1.2m/3)
2(-0.4m/3)
1.8m
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2-u22as 2a (Om/)(1.2m/3) 2(-0.4m/3) 1.8m

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Step 3

The total distance travelled by the car after...

-4.8m+1.8m
-6.6m
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-4.8m+1.8m -6.6m

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Tagged in

Science

Physics

Kinematics

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