How does the heat enhance
the rate of chemical reaction ? Explain in short.​

When the reactants are heated, the average kinetic energy of the molecules increases. This means that more molecules are moving faster and hitting each other with more energy. If more molecules hit each other with enough energy to react, then the rate of the reaction increases.

The objects are acted upon by only one force. gravity. mass times the acceleration of gravity (-9.81meters/second squared).