If it were not for air resistance, why would it be dangerous to go outdoors on rainy days?
Solution 37E If there is no air resistance the rain drops will freely from the cloud. Now because of the acceleration, the velocity of the raindrop will keep increasing. And near the ground, the velocity of the raindrop will be very high. So, even though, the mass of the raindrop is small, the momentum will be very high for the raindrop. So if that raindrop hit us, it can cause a huge damage. Now, the air resistance increases with velocity. So when the raindrop is falling from the cloud, its velocity increases, but the force due to air resistance will also increase. Now at a particular velocity, the force due to air resistance and the gravitational force will be same. Hence the acceleration will be zero. So the velocity will not increase further. Hence the momentum also remains in a safe limit and we can easily go out on a rainy day.