Identical objects, object X and object Y, are tied together by a string and placed at rest on an
incline, as shown in the figure. The distance
between the center of mass of each object is 2m.
The system of two objects is released from rest, and
a graph of the systems center of mass velocity as a
function of time is shown. Based on the data,
approximately how much time will it take the center
of mass of object X to reach point ) near the bottom
of the incline?

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

15. one purpose of the tread pattern on a tire is to a reduce tire wear. b. reduce traction c. allow water to flow away from the tire. d. look impressive.

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?