4 years ago

How to find kinetic energy with force, mass, and distance

Physics

1 answer:

vampirchik [111]4 years ago

4 0

Answer:

Explanation:

Set the equations for work and kinetic energy equal to each other. Work equals force times distance and kinetic energy equals one-half the mass of the object times its velocity squared, so F_d = (m_ ÷ _2)_v2. Substitute the measurements for force, distance and mass into the equation.

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A swimmer heading directly through a 200m wide river reaches the opposite shore in 6 min 40s. She is washed downstream 480 m. Ho

olga nikolaevna [1]

Answer :v=480m400s=1.2ms

2002+4802=H2

The hypotenuse H=520m

A quicker way to get the length of the hypotenuse is to recognize that this is a simple 5–12–13 triangle where the sides are multiples of 5, 12, and 13:

5(40) = 200m, 12(40)= 480m, 13(40)= 520m

We know that the swimmer travelled 520 m in 400 seconds, so her average speed was:

VR=520m400sec= 1.3ms

hope i got it right!! xx

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