Velocity vectors add up. We call this relative motion. A swimmer swims at 5 m/s relative to the water. The speed of the current in the river is 3 m/s. She swims so that she reaches the other side of the river at a position that is exactly opposite the place that she entered the river. It takes the swimmer 100 seconds to swim across the river in this manner. What is the width of the river? Hint: Vswimmer-water +Vwater-earth = Vswimmer-earth swim ends swim starts

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Projectile Motion