अर्जुन 50 m तैरता है और 50 s में शुरुआती बिंदु पर लौटता है। उसका औसत वेग क्या है?

Rahul travels 100 m to a point and returns to the starting position in 40 s. What is his average velocity?

If the distance covered by a moving body is halved while the time taken remains the same, its linear speed becomes _________.