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In this lesson, we will learn how to calculate the kinetic energy of an object moving relative to an observer given its mass and velocity.

Q1:

The Chicxulub crater in Yucatan, one of the largest existing impact craters on Earth, was created by an asteroid that has been modeled as impacting the Earth traveling at 22 km/s, dissipating 4 . 2 × 1 0 2 3 J of energy. What is the minimum mass of the asteroid necessary to have done this?

Q2:

An automobile of mass 2 . 0 0 × 1 0 3 kg has a velocity of 1 . 0 0 × 1 0 2 km/h, a runner of mass 80 kg has a velocity of 10.0 m/s, and an electron has a velocity of 2 . 0 × 1 0 7 m/s.

What is the kinetic energy of the automobile?

What is the kinetic energy of the runner?

What is the kinetic energy of the electron?

Q3:

What is the kinetic energy of a neutron moving at a speed of 2.2 km/s?

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