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A river is flowing south at a constant speed of 1.20 m/s. The river is 45 meters wide.

Alice swims in the direction perpendicular to the river.

In order to target the spot 90 meters south of the starting point on the bank of the other side, what should be Alice’s speed relative to the water?

Sagot :

mickymike92

Alice's speed relative to the water should be 0.6 m/s in order to target the spot 90 meters south of the starting point on the bank of the other side.

What is relative velocity?

Relative velocity refers to the velocity of an object with respect to another observer.

Velocity is speed in a given direction and is a vector quantity.

  • Velocity = displacement/time

There is relative velocity between Alice and the water.

Let Alice's velocity relative to the river be x

Time it will take her to cross the river = 45/x

The displacement of the river in that time is given below as;

Displacement = velocity * time

Velocity of river = 1.20 m/s

time, t = 45/x

d = 90 m

90 = 1.2 * 45/x

90x = 54

x = 54/90

x = 0.6 m/s

Therefore, Alice's speed relative to the water should be 0.6 m/s.

In conclusion, relative velocity is the velocity of one object from the reference point of another object.

Learn more about relative velocity at: https://brainly.com/question/24104949

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