A 2.00kg rock is dropped from the top of a 30.0m high building. Calculate the ball’s momentum at the time that it strikes the ground Help;)

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

What is the relationship between the direction of motion of the balloon and the wind currents

Which planets are visible without a telescope