Aball is thrown vertically upward from the top of a 100 foot tower, with an initial velocity of 10 ft/sec. its position function is s(t) = –16t2 + 10t + 100. what is its velocity in ft/sec when t = 2 seconds?

All you need to know is that velocity is the derivative with respect to time of position.

Therefore: ds/dt = -32t +10

To know the velocity at t=2s you just need to plug t=2 for t in the equation above.

the plateau is likely to turn into a desert do to corrosion.

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation: