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Motion In Straight Line

Question
CBSEENPH11026304
Wired Faculty App

A particle moves towards east for 2 s with velocity 15 m/s and move towards north for 8 s with velocity 5 m/s. Then, average velocity of the particle is

  • 1 m/s

  • 5 m/s

  • 7 m/s

  • 10 m/s

Solution

B.

5 m/s

Distance covered towards east 

          = speed × time

          =  2 × 15 = 30 m

Distance covered towards north

         = speed × time

         = 8  × 5 = 40 m

Total displacement

          = 402 + 302

           = 50 m

Average velocity = Total displacementTotal time

                          = 502 + 8

                          = 5 m/s     

Some More Questions From Motion in Straight Line Chapter

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.

Define distance.

Define displacement.

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