The table shows the speed of light in three states of matter. Material Speed (meters/second)
air
300,000,000
water
220,000,000
glass
200,000,000
At what point in time would the speed of light decrease?
A
when the light travels from water to air
B
when the light travels from air to water
с
when the light travels fronwglass to air
D
when the light travels from glass to water

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.