If the force acting on a body of mass 4 kg is doubled. by how much will the acceleration change? please be fast i have 4 hours.​

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost