Solved Questions Using Acceleration Formula:

1. What will be the Acceleration of a Car if it Slows from 90

kmh��ℎ to a Stop in 10 sec? 

Here, u = 90

kmh��ℎ =

90×518=25ms290×518=25��2 because initially it was moving at a speed of 90 kmph then reached zero.

Final Velocity ‘v’ = 0 kmph, and t  = 10 seconds

Now, applying the formula here:

a=(0−25)10=(−)2.5ms2�=(0−25)10=(−)2.5��2

2. A Girl Starts her Motion in a Straight Line at a Velocity of 30

ms��, her Velocity is Changing at a Constant Rate. If She Stops after 60 s, What is her Acceleration?

Answer: Here, the initial Velocity of a girl was 30

ms�� and stops, so her final Velocity will become 0 m/s. Now, the deceleration or retardation occurs, which is just the opposite of Acceleration and it can be determined as:

a=(0−30)60=(−)0.5ms2�=(0−30)60=(−)0.5��2

Question 3: A Car Moves in a Circular Track with a Constant Velocity; will it Experience Acceleration?

Answer: Here, the speed is constant; however, the direction is continuously varying, which means the Velocity is also varying. It states that the car will experience Acceleration.