Two object are 5kg and 10kg respectively and they're 10m apart. if the distance between them is increased to 20m. what happened to the gravitational force

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.