Question

a car travelling at 18 km/h speeds up to 54 km/h in 5 seconds. Find acceleration

Answer 1

here,
u=18km/h=18×5/18=5m/s
v=54km/h=54×5/18=15m/s
t=5s
a=(v-u) /t
a=15-10/5
a=5/5
a=1m/s^2
hope it helps you

Answer 2

Given, the initial velocity of the car,u= 18 km/hr = 5 m/s
           the final velocity of the car,v= 54 km/hr = 15 m/s
           t= 5s
solution, from equation of motion,
               v = u +at
               where v is final velocity, u is initial velocity, a is the acceleration of the body and t is the time.
             therefore, putting the values, we get
             15 = 5 +5t
           => 15-5 = 5t
           => 10 = 5t
           => t = 10/5 = 2 m/s^2