Question

In 5 seconds a car moving in a straight line increases its speed from 50 km/h to 65 km/h, while a truck goes from rest to 15 km/h in a straight line. Which undergoes greater acceleration? What is the acceleration of each vehicle?

Answer 1

Explanation:

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Acceleration comes out to be -3.

and the graph and its use in taking out the distance covered.

explanation of part A.

given is:-

Initial velocity (u)=54 km/h that is 15 m/s.

Final velocity (v)=0

Time (t)=5 sec.

To find:-Acceleration (a)

solution:- v=u+at(first equation of motion)

substituting the values

0=15+a×5

0=15+5a

-15=5a

-15/5=a

-3=a

Therefore acceleration is -3.

OR

Retardation/deaccleration is 3.

Hope it will help.

Regards,

Anshuman Khare.

Answer 2

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Acceleration comes out to be-3.

and the graph and its use in taking ou

the distance covered.

explanation of part A.

given is

Initial velocity (u)-54 km/h that is 15

m/s.

Final velocity (v)=0

Time (t)=5 sec.

To find:-Acceleration (a)

solution:- v=utat(first equation of

motion)

substituting the values

0=15+ax5

0-15+5a

-15-5a

-15/5-a