the train coverd half of its journey with a speed of 30 m/sand other half with of speed 40 m/ so calculate he speed of train during in hole jurney
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1
The total train journey speed is 35 m/s because the difference between those is 10 and half of 10 is 5 so u can add 5 in 30 and can subtract 5 to 40 the answer will 35
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2
all velocity vectors here are in the same direction.
Distance = x mtrs
time takes is (x/2 /30) + (x/2 /40)
= x/60 + x/80 sec
= (4x/240 + 3x/240) sec
= 7x/240 seconds
|velocity| = speed = dist (x) / time (7x/240)
= 1m/(7/240)sec
=240/7 m/sec
= 34.3 m/s
i hope it will help you
regards
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