Elaine and her bike have a combined mass of 50 kg. in a bicycle race, elaine uses the pedals to create a forward force of 75 n. assume that there is a constant 15 n of air resistance and an additional 10 n of rolling friction from the wheels. what will happen when the air resistance force combined with the friction are equal to 75 n?

May someone explain how to do this question?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i. e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i. e. include the distance traveled to the first encounter)