Suppose a cart is moving without any loss of energy to friction or air resistance. as the cart passes under a bridge, a heavy block is dropped vertically downward into the cart from a very small height above the cart. what happens to the speed of the cart

The speed of the cart will decrease.

Explanation:

In the said system energy shall remain conserved as it is an isolated system.

Initially the whole kinetic energy was with the mass of the cart now when we add some of the mass to the cart it's mass will increase but the energy will be same as that of initially of the lighter cart thus it's speed decrease to keep the kinetic energy constant.

Mathematically

i agree kid

explanation:

a

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.