Question

a car increases it speed from 20 km /h to 30 km /h in 10 sec . it's acceleration is​

Answer 1

Hey there,

Given :

u (initial speed) = 20km/hr

Now, we convert the km/hr to m/s by multiplying 5/18 :

$20 \times \frac{5}{18} = 5.55 \: m/s$

v (final speed) = 30km/hr

$30 \times \frac{5}{18} = 8.33 \: m /s$

So,

Now we finally have :

u (initial speed) = 5.55 m/s

v (final speed) = 8.33 m/s

t (time taken) = 10 seconds

So,

we know :

$a = \frac{v - u}{t}$

So,

putting the values , we get :

$a = \frac{8.33 - 5.55}{10} = 0.278$

thus we get :

acceleration= 0.278 m/s²

HOPE THIS HELPS

THANKS