C
a pclassroom.collegeboard.org/92/assessments/assignments/4514610
College Board
AP Classroom
Unit 4 Progress Check: MCQ Part A
Riley Antosz
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Question 5
5 seconds, the speed of the car is 25 m/s. Is the system
A toy car has an initial acceleration of 2 m/s" across a horizontal surface after it is released from rest. After the car travels for a timet
consisting of only the car an open system or a closed system, and why?
Open system because the acceleration of the car is not constant.
Open system, because an external force is applied to the car that causes it to accelerate.
Closed system, because the speed of the car is as expected in the case where an object has uniform acceleration for a timet
Closed system because mechanical energy was not removed from the system as a result of a net force
Rie
B
7:53 PM
12/11/2019