First slide

Average Acceleration

Question

A car moving on a straight road accelerates from a speed of 4.1 m/s to a speed of 6.9 m/s in 5.0 s. What was its average acceleration?

Moderate

A

0.56 m/ $s^{2}$
B

1.56 m/ $s^{2}$
C

5.6 m/ $s^{2}$
D

1.2 m/ $s^{2}$

Solution

$\large a = \frac{{v - u}}{t} = \frac{{6.9 - 4.1}}{5} \Rightarrow a = 0.56{\kern 1pt} {\kern 1pt} m/{s^2}$

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