Unit Test — Unit test Answers

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A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton’s laws of motion to explain the skydiver’s motion?

A
An upward force balances the downward force of gravity on the skydiver.
B
The skydiver’s inertia is zero, which no longer allows for acceleration.
C
An unbalanced force pulls the skydiver toward the ground.
D
The mass of the skydiver is so great that there is no acceleration.
24

Which does a reference point provide?

A
a position from which to measure future distance
B
a set of standard units for measuring displacement
C
a standard method for evaluating variables
D
a method for determining the speed of an object
25

What is the momentum of a 5 kg object that has a velocity of 1.2 m/s?

A
3.8 kg • m/s
B
4.2 kg • m/s
C
6.0 kg • m/s
D
6.2 kg • m/s

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