Megan was doing time trials on her bike around a 400 meter horizontal track. compare the forward force on the bike with the backward force when megan was travelling at a constant speed. select the correct answer

Ineed the answers for these promblems i have

Select all of the following that are equal to an impulse of 20 unitsa) force= 5, time= 5.5b) force= 25, time= 0.8c) force= 0.1, time= 200d) force= 10, time= 2(its b, c, and d)(also in order to find answer they have to add to get the unit)ex= 25x.8=20 or .1x200=20

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c