The average speed of a car which covers half the distance with a speed of 30 m/s and other half with a speed of 50 m/s in equal intervals of time is ?
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A body covers half the distance with a speed of 20 m/s and other half with a speed of 30 m/s.What is the average velocity of the body?
I presume that by "speed", we mean "velocity" & that all velocity vectors here are in the same direction.
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
good luck next time
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