The average acceleration of the shoes thrown at him, a =2.775 m/s².
<h3>Equation :</h3>
To find the acceleration with given data we use this formula,
v = u + aΔt
Where,
v is final velocity
u is initial velocity
a is acceleration
Δt is time
So,
v - u = aΔt
a = v - u /Δt
a = 12km/hr - 0 / 1.2 s
a = 12km/hr / 1.2s
Changing km/hr into m/s,
1 kilometer/hour = 1000meters / 3600 seconds
We get,
12km/hr = 3.33m/s
a = 3.33 m/s / 1.2s
a = 2.775 m/s²
<h3>
What is velocity ?</h3>
When an object is moving, its velocity is the rate at which its direction is changing as seen from a specific point of view and as measured by a specific unit of time. Velocity is the rate and direction of an object's movement, whereas speed is the time rate at which an object is moving along a path.
To know more about speed :
brainly.com/question/28224010
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