AP Physics 1 Unit 1B: Kinematics: 2D Motion & Projectiles — practice questions — page 4

Explore 92 free Unit 1B: Kinematics: 2D Motion & Projectiles questions in AP Physics 1 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 1B: Kinematics: 2D Motion & Projectiles questions and exercises with answers

Showing questions 91–92 of 92.

The work done by gravity on a 2 kg body falling 5 m freely (g = 10 m/s²) is:Read the answer and worked solution →The kinetic energy of an electron of mass 9.1 × 10⁻³¹ kg moving at 1 × 10⁶ m/s is approximately:Read the answer and worked solution →

Worked practice questions

The work done by gravity on a 2 kg body falling 5 m freely (g = 10 m/s²) is:

10 J
25 J
100 J
50 J

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Correct answer: C. 100 J

W = mgh = 2·10·5 = 100 J.

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The kinetic energy of an electron of mass 9.1 × 10⁻³¹ kg moving at 1 × 10⁶ m/s is approximately:

1.82 × 10⁻¹⁸ J
4.55 × 10⁻¹⁷ J
9.1 × 10⁻²⁵ J
4.55 × 10⁻¹⁹ J

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Correct answer: D. 4.55 × 10⁻¹⁹ J

K = ½·9.1×10⁻³¹·(10⁶)² = 4.55 × 10⁻¹⁹ J.

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