Aconstant 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 2 .
c) the sled’s speed will be v 2 and its kinetic energy will be 2k.
d) the sled's speed will be v 2 and its kinetic energy will be k 2 .
e) the sled's speed will be 4v and its kinetic energy will be 2k.

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? your

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system