A constant horizontal pull acts on a sled on a horizontal ...

[ec501234]

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.

Question 2

A 4.0-kg cylinder of solid iron is supported by a string while submerged in water. What is the tension in the string? The density of iron is 7860 kg/m3 and that of water is 1000 kg/m3.
 
  A) 24 N B) 40 N C) 20 N D) 2.5 N E) 34 N

[yasmina]

Answer to Question 1

C

Answer to Question 2

E

[ec501234]

Wow, this really help

[nanny]

Thanks for the timely response, appreciate it