Question

a car increases its speed from 20 km per hour to 30 km per hour in 10 second its acceleration is
a 30m/s²
b 3m/s²
c 18m/s²
d .830m/s²​

Answer 1

Given u=20km/hr= 50/9m/s

v=30km/hr= 25/3m/s

using v-u/t

(25/3-50/9)/10

={(75-50)/9}/10

=(25/9)/10

=25/9×10

=0.27777777m/s^2

=0.28m/s^2 (approx)