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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

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

Grade:Upto college level

1 Answers

pankaj kumar raman
51 Points
9 years ago

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

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