Subject :NSO Class : Class 8
A body goes from point X to point Y with a speed of 10 m s-1. It comes back to X with a speed of 20 m s-1. The average speed of the body during the journey is ______.
(a) 15 m s-1
(b) 16.6 m s-1
(c) 13.3 m s-1
(d) 30 m s-1
how to get answer ?
Ans 1:
Class : Class 9
Add both speeds and divide by 2.
(20+10)/2=15 meters per second