Question

A car is traveling north at 28.3 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the cars average acceleration

Answer 1

here,

the initial velocity of car , u = 28.3 j m/s

time taken , t = 12 s

the final velocity of car , v = 14.1 j m/s

let the acceleration be a

using first equation of motion

v= u + a * t

14.1 j = 28.3 j + a * 12

solving for a

a = - 1.18 j m/s^2

the acceleration is 1.18 m/s^2 and towards South