Simple Mechanics confusing me:S

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  • #1
brandon26
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A boy whirls a stone in a horizontal circle of radius 1.2 m and at height 1.7 m above ground level. The string breaks, and the stone flies horizontally and strikes the ground after traveling a horizontal distance of 10 m. What is the magnitude of the centripetal acceleration of the stone while in circular motion?

Please help!
 

Answers and Replies

  • #2
Doc Al
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Use the kinematics of projectile motion to find the initial speed of the stone. Then use that speed to calculate the centripetal acceleration.
 
  • #3
brandon26
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Doc Al said:
Use the kinematics of projectile motion to find the initial speed of the stone. Then use that speed to calculate the centripetal acceleration.

yes, I used V^2=u^2 + 2as , where V=0 and u is the speed to be found. But the answer comes out wrong.
 
  • #4
Doc Al
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Try finding the time it takes for the object to fall. Then use that time to calculate the horizontal speed.
 
  • #5
brandon26
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Wicked. Got the answer right by working out the time. Thanx.
PS. i got the firwst answer wrong because I assumed that V= o , but that was false
 

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