A Constant Horizontal Pull Acts on a Sled on a Horizontal

question 1366

Multiple Choice

A constant horizontal pull acts on a sled on a horizontal frictionless ice pond.The sled starts from rest.When the pull acts over a distance x,the sled acquires a speed v and a kinetic energy K.If the same pull instead acts over twice this distance:

• A) The sled's speed will be 2v and its kinetic energy will be 2K.
• B) The sled's speed will be 2v and its kinetic energy will be K .
• C) The sled's speed will be v and its kinetic energy will be 2K.
• D) The sled's speed will be v and its kinetic energy will be K .
• E) The sled's speed will be 4v and its kinetic energy will be 2K.

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