Home
Class 9
PHYSICS
Joseph jogs from one end A to other end ...

Joseph jogs from one end `A` to other end `B` of a straight `300m` 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 speeds and velocities in Jogging (a) from `A` to `B` and (b) from `A` to `C`?

Text Solution

Verified by Experts

The correct Answer is:
(a) average speed=average velocity `=2.00 m s^(-1)`
(b) average speed `=1.90 m s^(-1)`; average velocity `=0.958 m s^(-1)`
Total Distance covered from AB = 300m
Total time taken = `2xx60+30` s
= 150 s

Therefore, Average Speed from AB = Total Distance / Total Time
= 300/150 m `s^(-1)`
= 2 m `s^(-1)`
Therefore, Velocity from AB = Displacement AB / Time = 300/ 150 m `s^(-1)`
= 2 m `s^(-1)`
Total Distance covered from AC = AB + BC
= 300 + 200 m
Total time taken from A to C = Time taken for AB + Time taken for BC
= (`2xx60+30`)+60 s
= 210 s
Therefore, Average Speed from AC = Total Distance /Total Time
= 400/210 m `s^(-1)`
= 1.904 m `s^(-1)`
Displacement (S) from A to C = AB - BC
= 300-100 m
= 200 m
Time (t) taken for displacement from AC = 210s
Therefore, Velocity from AC = Displacement (s) / Time (t)
= 200/210 m `s^(-1)`
= 0.952 m `s^(-1)`
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

Joseph jogs from one end A to other end B of a straight 300m 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 speeds and velocities in Jogging (a) form A to B and (b) form A to C ?

Joseph jogs from one end A to the other end B of a straight 300 m road in 2 min 50 s and then turns around and jogs 100 m back to point C in another 1 min. What are Joseph's average speeds and velocities in jogging (i) from A to B and (ii) from A to C ?

Alka jogs from one end A to the other end B of a srtaight 250 m road in 1 minute and 4 seconds. Then turns around and jogs 50 m back to point C in 30 seconds. Calculate average speed and average velocity in jogging from (i) A to B and (ii) A to C .

A car is moving along a straight (OP). It moves from O "to" P in 18 seconds and returns from P "to" Q in 6 seconds, where OP=360 m and OQ=240 m What are the car the average velocity and average speed of the car in going (a) from O "to" P and back to Q ?

A cyclist moving on a circular track of rakies 200 m completely is 5 minutes. What his (a) average speed (b) average velocity in one full revolution?

A particle goes from point A to point B, moving in a semicircle of radius 1 m in 1 second. Find the magnitude of its average velocity.

A car moves from point M to point N with uniform speed in 3 min. There, the car remains standing for 2 min. Then, it comes back to point M with uniform speed in 2 minutes.

A car is moving round a circular track with a constant speed v "of" 20 m s^(-1) (As shown in figure).At different times,the car is at A,B and C,respectively . Find the velocity change (a) from A to C, and (b) from A to B. .

In one second, a particle goes from point A to point B moving in a semicircle (Fig). Find the magnitude of the average velocity.

Usha swims in a 90 m long pool. She covers 180 m in one minute by swimming from one end to the other and back along the same length path. Find the average speed and average speed and average velocity of Usha.