Question

a body covers 20 metre in first second 25 m in second and 45 m in the third second what is the average speed of the body?

Answer 1

S1=25m,S3=45m,.if the body is under constant acceleration then S2=35m.therefore average speed =25+35+45/3=35m/s

Answer 2

IN 1second=20m
In 2 second =(25+20)m=45m
In 3 seconds=(45+45)m=90m
So,we conclude that a body covers 90m in 3seconds
Average speed=total distance covered/total time taken
=90m/3sec
=30m/s