How much power does a weightlifter expend when lifting a 50-kg (500N) barbell a vertical distance of 1.2 m in a time interval of 1.5 s

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air