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Motion In Straight Line

Question
CBSEENPH11020672
Wired Faculty App

A particle covers half of its total distance with speed v1 and the rest half distance with speed v2. Its average speed during the complete journey is

  • v1v2 / v1 + v2

  • 2v1v2/v1 + v2

  • 2v12v22 / v12 + v22

  • v1 + v2 / 2

Solution

B.

2v1v2/v1 + v2

Velocity v = s / t
s = vt
The average speed of particle
straight v subscript av space equals space fraction numerator straight s space plus space straight s over denominator begin display style straight s over straight v subscript 1 end style plus begin display style straight s over straight v subscript 2 end style end fraction straight v subscript av space equals space fraction numerator 2 straight v subscript 1 straight v subscript 2 over denominator straight v subscript 1 space plus straight v subscript 2 end fraction

Some More Questions From Motion in Straight Line Chapter

Is absolute rest or absolute motion possible?

What is the most essential thing to study the motion of a body?

Can a body be always at rest in some frame?

Can a body be in motion in the frame associated with the body itself?

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

 A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion: 

(a) A kite flying in the sky.

(b) The earth revolving around the sun. 

(c) A train moving along the equator of the earth in clockwise direction. 

(d) Accelerated motion of a particle in a straight line.

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