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Motion In Straight Line

Question
CBSEENPH11020635
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A boy standing at the t op of a tower of 20 m height drops a stone. Assuming g = 10 ms-2, the velocity with which it hits the ground is 

  • 20 m/s

  • 40 m/s

  • 5 m/s

  • 10 m/s

Solution

A.

20 m/s

Given, g = 10 ms-2 and h = 20 m
We have
straight v space equals space square root of 2 gh end root space equals space square root of 2 space straight x space 10 space straight x 20 end root space equals space square root of 400 space equals space 20 space ms to the power of negative 1 end exponent

Some More Questions From Motion in Straight Line Chapter

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.

Can magnitude of displacement be greater than distance travelled by particle?

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