Question

a body covers one third of its journey with speed u , next third with speed v , and the last third with speed w. calculate the average speed of the body over the entire journey ​

Answer 1

Average speed=

total time taken

total distance covered

At the total distance=3x

Time taken to cover first one third(x)

=

t

1

=

v

1

x

Time taken to cover second one third=t

2

=

v

2

x

Time taken to cover 3

rd

one third=t

3

=

v

3

x

Average speed=

v

1

x

+

v

2

x

+

v

3

x

3x

=

v

1

1

+

v

2

1

+

v

3

1

3

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