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Author Question: A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and ... (Read 93 times)

naturalchemist

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on: Jul 29, 2018
A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point?
 
  A) 2.0 J
  B) 1.0 J
  C) 0.50 J
  D) 0.25 J
  E) 4.0 J

Question 2

A rock is dropped from the top of a vertical cliff and takes 3.00 s to reach the ground below the cliff.
 
  A second rock is thrown vertically from the cliff, and it takes this rock 2.00 s to reach the ground below the cliff from the time it is released. With what velocity was the second rock thrown, assuming no air resistance?
  A) 4.76 m/s upward
  B) 5.51 m/s downward
  C) 12.3 m/s upward
  D) 4.76 m/s downward
  E) 12.3 m/s downward
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mohan

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Reply #1 on: Jul 29, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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naturalchemist

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Reply 2 on: Jul 29, 2018
Wow, this really help

daiying98

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Reply 3 on: Yesterday
Gracias!

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