Question

A car is increase its speed from 15 km /h to 30 km /h in 12 seconds.whats its acceleration?

Answer 1

u=15*5/18
v=30*5/18
t=12sec
acceleration= v-u/t
                    =[50/6-25/6]/12
                     = 25/6/12
                      =25/72 
                        =0.34m/s^2
                       
 
             
                      

Answer 2

u = 15kmph= 75/18 m/s
v = 30kmph= 150/18 m/s, t= 12s
So,
Acceleration= (v-u)/t

a= (150/18 - 75/18)/12

a= 75/216

a= 0.34722 m/s^2......ans