Question

a car travelling at18km/hr speeds up to 54km/hr in 5seconds . what is its acceleration

Answer 1

u = 18km/h = 18×5/18= 5 m/s
v = 54km/h = 54×5/18= 15 m/s
t = 5 seconds
v = u+at
15 = 5 + 5a
15-5=5a
5a=10
a= 10/5
a = 2 m/s²

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Answer 2

Given :
initial speed=u= 18km/hr=18x5/18= 5m/s
Final speed=V=54km/hr=54x5/18=15m/s
time=t=5sec
a=?
Formula to be used :
a=v-u/t
=(15-5)/5
=10/5
=2m/s²
∴ Acceleration is 2m/s²