Question

A vehicle moving in a straight road has its
speed changed from 5 m/s to 8 m/s in 2 sec
What is its average acceleration ?
1) 1 m/s2 2) 1.5 3) 2 m/s2 4) zero​

Answer 1

acceleration of the vehicle would be 1.5 m per second square. option 2 is correct

Given

• speed changed from 5 m/s to 8 m/s
• in 2 sec

To find

• its average acceleration

solution

we are provided with the initial and final velocity of a vehicle and the time taken for this change and asked to find the acceleration of the vehicle.

we know that acceleration of a vehicle is defined as the rate of change of velocity,

that is, acceleration would basically mean the difference between the final and initial velocity divided by the time taken for this change

therefore acceleration = (8-5)/2

or, a = 3/2

or, a = 1.5m/s^2

therefore acceleration of the vehicle would be 1.5 m per second square. option 2 is correct

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Answer 2

Answer:

Its average acceleration is 1.5 m/s²

Step-by-step explanation:

As per the data given in the question,

we have,

final velocity of the vehilce(v)= 8 m/s

initial velocity of the vehilce(u)= 5 m/s

Time taken to change the speed(t)= 2sec

As we know

$v=u+at\\8=5+2a\\3=2a\\a=1.5\:m/s^{2}$

Hence, its average acceleration is 1.5 m/s²

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