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A proton moves at 0.950c. Calculate its (a) rest energy, (b) total energy, and (c) kinetic energy.
A person lifts a $4.5 \mathrm{kg}$ cement block a vertical distance of $1.2 \mathrm{m}$ and then carries the block horizontally a distance of $7.3 \mathrm{m} .$ Determine the work done by the person and by the force of gravity in this process.
Can the kinetic energy of an object be negative? Explain your answer.
Two identical objects move with speeds of $5.0 \mathrm{m} / \mathrm{s}$ and $25.0 \mathrm{m} / \mathrm{s} .$ What is the ratio of their kineticenergies?
What is the kinetic energy of an automobile with a mass of $1250 \mathrm{kg}$ traveling at a speed of $11 \mathrm{m} / \mathrm{s} ?$
What speed would a fly with a mass of 0.55 g need in order to have the same kinetic energy as the automobile in item $19 ?$
