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Question

A car decreases its speed from 80 kmhr1 to 60 kmhr1 in 5 seconds. The acceleration of the car is:


A
1.11 ms2
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B
1.11 ms2
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C
1.62 ms2
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D
1.62 ms2
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Solution

The correct option is D 1.11 ms2
Given:
Initial velocity:
u=80 kmhr1
u=80×518=22.22 ms1

Final velocity:
v=60 kmhr1
v=60×518=16.67 ms1
Time taken, t=5 s
Let 'a' be the acceleration of the car.
From definiton of acceleration:
 a=v  ut
a=16.67  22.225 
a=1.11 ms2
Acceleration of the car is 1.11 ms2.

Physics

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