chapter 5
work, energy and power
Science
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2 questions
Question 1
Multiple Choice
1 point
In which one of the following situations will there be an increase in kinetic energy?
A.A projectile approaches its maximum height.
B.A ball starts from rest and freely rolls downhill.
C.A box is pulled across a rough floor at constant speed.
D.A satellite travels in a circular orbit around the earth at fixed altitude.
Question 2
Multiple Choice
1 point
The kinetic energy of an 1800-kg truck is 7.2 × 105 J. What is the speed of the truck?
A.25 m/s
B.33 m/s
C.28 m/s
D.17 m/s