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A 50kg cyclist, pedaling at 20 km/hr = 5.56m/s, climbs a 1 km hill in 30mins (.556m/s). What average total force on her bicycle is required for her to make it up the hill in this amount of time?

I know that I have to find the acceleration to calculate the force, since N=(kg*m)/s^2. What equation would I use to accomplish this?