and (c) the normal force. (d) What is the net v 2. You throw a 20-N rock vertically into the air f 15.0 m above the ground, it is traveling at 25.0 find (a) the rock's speed just as it left the arou

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Chapter1: Units, Trigonometry. And Vectors
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Can you help me answer no. 2 and 3? 

1. An 8.00 kg package in a mail-sorting room slides 2.00 m down a chute that is inclined at
53.0° below the horizontal. The coefficient of kinetic friction between the package and the
chute's surface is 0.40. Calculate the work done on the package by (a) friction, (b) gravity,
and (c) the normal force. (d) What is the net work done on the package?
2. You throw a 20-N rock vertically into the air from ground level. You observe that when it is
15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work-energy theorem to
find (a) the rock's speed just as it left the ground and (b) its maximum height.
3. Adult cheetahs, the fastest of the great cats, have a mass of about 70 kg and have been
clocked running at up to 72 mph (32 m/s). (a) How many joules of kinetic energy does such
a swift cheetah have? (b) By what factor would its kinetic energy change if its speed were
doubled?
Transcribed Image Text:1. An 8.00 kg package in a mail-sorting room slides 2.00 m down a chute that is inclined at 53.0° below the horizontal. The coefficient of kinetic friction between the package and the chute's surface is 0.40. Calculate the work done on the package by (a) friction, (b) gravity, and (c) the normal force. (d) What is the net work done on the package? 2. You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work-energy theorem to find (a) the rock's speed just as it left the ground and (b) its maximum height. 3. Adult cheetahs, the fastest of the great cats, have a mass of about 70 kg and have been clocked running at up to 72 mph (32 m/s). (a) How many joules of kinetic energy does such a swift cheetah have? (b) By what factor would its kinetic energy change if its speed were doubled?
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