Question

A body covers 1/3 of its journey with speed 20m/s next 1/3 of with speed 30m/s with what speed should cover the remaining part of journey so that entire average speed is 40m/s.

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Answer 1

Answer:

70m/s , is the speed the remaining part of the journey has to be covered with

Answer 2

Distance = x mtrs

time takes is (x/2 /20) + (x/2 /30)

= x/40 + x/60 sec

= (3x/120 + 2x/120) sec

= 5x/120 seconds

|velocity| = speed = dist (x) / time (5x/120)

= 1m/(5/120)sec

=120/5 m/sec

= 24 m/s

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