An ore cart of mass 1200 kg is rolling at a speed of 10.8 m/s across a flat surface. A crane dumps ore into the cart from directly above it after which the cart travels at 9.3 m/s. What mass of ore did the crane add to the cart? Assume that frictional forces with the flat surface a
negligible.
240 kg
110 kg
190 kg
92 kg

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.

Iwas going to ask that quesytion  sorry dude i dont  know : (    : /