Mathematical Problem 2.2 From My Physics Book
Level
1
The Velocity of a car decreases uniformly from 20m/s and after 4s it becomes 4m/s . What is the acceleration of the car in m/s^2 ?
-4
16
4
-16
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Here, initial velocity u =20ms-1 final velocity v =4ms-1 time t =4s ∴acceleration a = ?
We know, a=v–u/t or, a =4ms-1 – 20ms-1/4s or, a =-16ms-1/4s so, a = - 4ms-2
Ans : - 4ms