Question

If a car attains a speed of 36 Km/h from rest in 12 minutes time, what is the distance covered?

Answer 1

u = 0
v = 36 km/h =20 m/s
t = 12 min = 720 sec
as. v= u +at
⇒20 = 0 + 720a
⇒a = 20/720 = 1/36 m/s²
now, s = ut + (1/2)at²
           = 0 + (1/2)×(1/36)×(720)²
           = 7200 m
           = 7.2 km

Answer 2

Given,
u = 0
v = 36 km/h =20 m/s
t = 12 min = 720 sec
As we know that,
v= u +at
By implying values,we get
⇒20 = 0 + 720a
⇒a = 20/720 = 1/36 m/s²
And now,
s = ut + (1/2)at²
= 0 + (1/2)×(1/36)×(720)²
= 7200 m
= 7.2 km

So the distance covered is 7.2 km