Question

A car traveling at 20 km per hour speeds up to 60 km per hour and 6 seconds what is its acceleration

Answer 1

Hello !
 u = 20 km / hr = 5.5 m/s 
 v = 60 km/  hr = 16.6 m /s
___________________
Acceleration(a) = v-u / t
where v = final velocity 
           u = initial velocity 
            t = time  = 6 seconds 
_____________________
a =  16.6 - 5.5 / 6 
   = 11.1 / 6
   = 1.85 m/s²
_____________________
   

Answer 2

u=20km per hour
5/18×20m/sec

v=60km per hour
5/18×60m/sec

v=u+at
300/18-100/18=6a
200/18×1/6=a

a=1.8m per second square (approx)