In which collisions did the shooter marble change direction? How did the mass of the target marble (stationary) compare with the shooter marble in these collisions?

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

The amount of potential energy possessed by an elevated object is equal to what?