Question

A particle travels one third of total distance of the journey with speed 10 m/s the next one third of total distance with speed 20 m/s and the remaining distance with speed 40 m/s the average speed of the particle of journey is

Answer 1

Explanation:

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

.