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  • Answer please! A boy standing at the top of a tower of 20m height drops a stone. Assuming g=10ms-2, the velocity with which it hits the ground is

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

  • Option 1)

    10.0m/s

  • Option 2)

    20.0m/s

  • Option 3)

    40.0m/s

  • Option 4)

    5.0m/s

 

Answers (1)

best_answer

As learnt in

3rd equation or Velocity –displacement equation -

V^{2}-u^{2}=2as

V ightarrow Final Velocity

s ightarrow Displacement

u ightarrowInitial velocity

a ightarrowacceleration

-

 

 u = 0

v^{2} = u^{2}+2gh\ \ \ \ \ = v = \sqrt{2gh}= \sqrt{2\times 10\times 20}

v = 20 ms-1


Option 1)

10.0m/s

This option is incorrect

Option 2)

20.0m/s

This option is correct

Option 3)

40.0m/s

This option is incorrect

Option 4)

5.0m/s

This option is incorrect

Posted by

Plabita

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