Multiple Choice
At a given instant, the acceleration of a certain particle is zero. This means that:
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2. 1D Motion / Kinematics
Intro to Acceleration
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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?
A
33.33 m/s²
B
60.00 m/s²
C
24.00 m/s²
D
47.62 m/s²
Verified step by step guidance1
First, convert the final velocity from km/h to m/s. Since 1 km/h is equal to 1/3.6 m/s, multiply 120 km/h by 1/3.6 to get the velocity in m/s.
Identify the initial velocity (u) of the air, which is 0 m/s since it starts from rest.
Identify the time (t) over which the acceleration occurs, which is given as 0.70 seconds.
Use the formula for acceleration (a), which is a = (v - u) / t, where v is the final velocity, u is the initial velocity, and t is the time.
Substitute the values into the formula: a = (final velocity in m/s - 0 m/s) / 0.70 s to find the acceleration in m/s².
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