smart person

we can just use the gravitational potential energy formula to work out how much kinetic energy 1kg would have after falling for 1 second, to give us the theoretical minimum power required to generate an equal and opposite reaction force against gravity. first find height after one second of falling using integration: v=9.8t, => d=4.9t^2, d=4.9*1^2=4.9m. work out GPE based on height: GPE = mgΔh, GPE = 1kg * 9.8 * 4.9 = 48.02J, P = 48.02J/s = 48.02W. looks like you were correct?