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Motion In Straight Line

Question
CBSEENPH11020564
Wired Faculty App

A particle is moving such that its position coordinates (x,y) are (2m, 3m) at time t = 0, (6m, 7m) at time t = 2 sec and (13 m, 14m) at time t= 5 sec. Average velocity vector (vav) from t = 0 to t = 5 s is,

  • 1 fifth left parenthesis 13 space i with hat on top space plus space 14 space j with hat on top right parenthesis
  • 7 over 3 open parentheses i with rightwards arrow on top space plus space j with hat on top close parentheses
  • 2 space left parenthesis straight i with hat on top space plus space straight j with hat on top right parenthesis
  • 11 over 5 open parentheses i with hat on top plus j with hat on top close parentheses

Solution

D.

11 over 5 open parentheses i with hat on top plus j with hat on top close parentheses

Average velocity vector,

straight v subscript av space equals space fraction numerator Net space displacement over denominator Time space taken end fraction space space space space space space equals space fraction numerator left parenthesis 13 minus 2 right parenthesis straight i with hat on top space plus space left parenthesis 14 minus 3 right parenthesis straight j with hat on top over denominator 5 end fraction space space space space space space equals space fraction numerator 11 space straight i with hat on top space plus space 11 space straight j with hat on top over denominator 5 end fraction space space space space space space space equals space 11 over 5 open parentheses straight i with hat on top space plus space straight j with hat on top close parentheses

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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