Mechanics> average speed and average velocity...

1-what is the diffrence between average speed and average velocity?

2-plz answer the problem..............

a motor car is going due north at a speed of 50 km/hr.it makes a 90 degrr left turn without changing its speed.the change in the velocity of the car is about---------------------

options:50 km/hr towards west

70 km/hr towads south west

0

plz explain me

sindudharsana sindudharsana , 14 Years ago

Grade Upto college level

1 Answers

pankaj kumar raman

1)average speed is the total distance travelled by a body in a given time

whereas average velocity is the total displacement of the body in the given time with specific direction

2)its 70km/hr towards south west

because let N-S dirn. say j-direction

& E-W say i-dirn.

hence initial vel=50j

final vel=50i

& hence change in vel= final- initial

=50i-50j

= ie 50√2 in south west direction

=70km/hr in south west dirn.

all the best

Approved

Last Activity: 14 Years ago

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Mechanics> average speed and average velocity...

sindudharsana sindudharsana , 14 Years ago

pankaj kumar raman

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