Two different objects are 3 meters from the reference point on a graph and share the same y-coordinate. Choose the TRUE statement.
A. Their positions are 6 meters apart.
B. They must have the same position.
C. They must have the same x-coordinate value.
D. A line between them would need to be horizontal.

Describe the path of a ray that approaches a mirror parallel to the principal axis.

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

What sort of waves exhibit the doppler effect?