If a rock is thrown upward on the planet mars with a velocity of 17 m/s, its height (in meters) after t seconds is given by h = 17t − 1.86t2. (a) find the velocity of the rock after one second.

What happens to the light rays when they hit the specimen?

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

It is really hard for me right know