John throws a rock down with speed 15 m/s from the top of a 27-m tower.If g = 9.8 m/s2 and air resistance is negligible,what is the rock's speed just as it hits the ground?

A) 22 m/s B) 27 m/s C) 754 m/s D) 23 m/s E) 16 m/s A) 22 m/s B) 27 m/s C) 754 m/s D) 23 m/s E) 16 m/s

Exam 2: Motion in One Dimension

John throws a rock down with speed 15 m/s from the top of a 27-m tower.If g = 9.8 m/s² and air resistance is negligible,what is the rock's speed just as it hits the ground?

(Multiple Choice)

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Question 61

Starting from rest,a car accelerates down a straight road with constant acceleration a for a time t,then the direction of the acceleration is reversed, (i.e. ,it is −a),and the car comes to a stop in an additional time t,the time for the whole trip being 2t.At what time,or times,is the average velocity of the car for the trip equal to its instantaneous velocity during the trip?

(Multiple Choice)

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Question 62

A Cessna aircraft has a lift-off speed of 120 km/hr.What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 270 m?

(Multiple Choice)

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Question 63

A cheetah can maintain its maximum speed of 97 km/hr for 29.0 seconds.What minimum distance must a gazelle running 78 km/hr be ahead of the cheetah to escape?

(Multiple Choice)

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Question 64

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Exam 2: Motion in One Dimension

John throws a rock down with speed 15 m/s from the top of a 27-m tower.If g = 9.8 m/s2 and air resistance is negligible,what is the rock's speed just as it hits the ground?

A Cessna aircraft has a lift-off speed of 120 km/hr.What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 270 m? ​

A cheetah can maintain its maximum speed of 97 km/hr for 29.0 seconds.What minimum distance must a gazelle running 78 km/hr be ahead of the cheetah to escape?

Introduction

Introduction: Part A

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

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John throws a rock down with speed 15 m/s from the top of a 27-m tower.If g = 9.8 m/s² and air resistance is negligible,what is the rock's speed just as it hits the ground?

A Cessna aircraft has a lift-off speed of 120 km/hr.What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 270 m?