If you stand motionless under an umbrella in a rainstorm where the drops fall vertically, you remain relatively dry. However, if you start running, the rain begins to hit your legs even if they remain under the umbrella. Why?
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If you stand vertically under an umbrella when the rain falls, you remain practically dry but if you start running, the ram begins to hit your legs because the resultant acts along relative direction as shown.
Step 2 of 3</p>