A2kg marble is moving at 3 m/s when it strikes another 4kg marble moving in the opposite direction at -3 m/s. what will be the velocity of the 4kg marble after the collision of the 2kg marble's new velocity is -4 m/s. also state the direction of the 2kg marble after they hit.

In which scenario is the least amount of work done on a crate? a force of 120 n moves it 25 m. a force of 115 n moves it 26 m. a force of 130 n moves it 22 m. a force of 125 n moves it 27 m.

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90