Question

a car increases its speed from 20 kilometre per hour to 50 km per hour in 10 seconds what is the acceleration

Answer 1

Speed of car in m/s =5/18*20=100/18m/s
speed of car inm/s=5/18*50=250/18m/s
Now,
accrleration=v-u/t
250/18-100/18
-----------------------
10
150/18
-----------
10
1500/18 m/s square is the answer