Answer:
Their deceleration is - 19 [tex]\frac{m}{s^{2} }[/tex]
Explanation:
Acceleration is a quantity that indicates how the speed of the object changes over time. In other words, acceleration is a vector quantity that relates changes in velocity to the time it takes to occur. It is normally represented by the letter a and its unit of measurement, in the International System it is meters per second squared [tex]\frac{m}{s^{2} }[/tex].
The mathematical expression for the acceleration is:
[tex]a=\frac{final speed - initial speed}{final instant - initial instant}[/tex]
In this case:
Replacing:
[tex]a=\frac{0 \frac{m}{s} - 2.8\frac{m}{s} }{0.15 s - 0s}[/tex]
a= -18. 667 [tex]\frac{m}{s^{2} }[/tex] ≅ -19 [tex]\frac{m}{s^{2} }[/tex]
Deceleration is a quantity that expresses the passage of a moving body from one speed to a lower speed. Mathematically it is calculated as the acceleration but the result will be a negative acceleration.
Their deceleration is - 19 [tex]\frac{m}{s^{2} }[/tex]
