Chapter 7

NCERT
Class 9
Science
Solutions
2. Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute what are joseph's average speed and velocities in jogging

Question:

Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute what are joseph's average speed and velocities in jogging (a) from A to B and (b) from A to C.

Answer:

From point A to BDistance covered= 3oom Displacement= 3oo m Time taken= 2 min 30 See = (2 * 6o) + 30 = 150 sec Average speed= Distance covered/ Time taken = 300/150 =2m/secAverage velocity=  Displacement/ Time Taken= 300/150 = 2m/sec From point A to C Distance covered= 300 + 100 = 400mDisplacement= 300 - 100 = 200m Time taken= 3 min 30 sec = (3 * 60) +30 = 210 sec Average speed= Distance covered/ Time taken 400/210 =1.90m/ sec Average velocity= Displacement/ Time Taken = 200/210 = 0.95 m/sec.

Buy Latest Books

Teacher's Corner