Multiple Choice
When you sneeze, the air in your lungs accelerates from rest to 120 km/h in approximately 0.70 s. What is the acceleration of the air in m/s²?
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2. 1D Motion / Kinematics
Intro to Acceleration
Multiple Choice
Which of the following represents a case in which you are not accelerating?
A
Slowing down to a stop
B
Driving in a straight line at a constant
C
Speeding up while moving forward
D
Turning a corner at a constant
Verified step by step guidance1
Understand that acceleration is defined as any change in velocity, which includes changes in speed or direction.
Analyze each option: 'Slowing down to a stop' involves a decrease in speed, so acceleration is present.
'Speeding up while moving forward' involves an increase in speed, so acceleration is present.
'Turning a corner at a constant speed' involves a change in direction, which means velocity changes, so acceleration is present.
Therefore, the only case with no acceleration is 'Driving in a straight line at a constant velocity' because neither speed nor direction changes.
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