First slide

Instantaneous acceleration

Question

A body travels a distance of 20m in the 7^th second and 24 m in 9^th second. How much distance shall it travel in the 15^th second?

Easy

A

10m
B

16m
C

24m
D

36m

Solution

$\begin{array}{l} \frac{S_{9} - S_{7}}{2} = a = \frac{4}{2} = 2 m / s^{2} \\ s_{15} = S_{9} + 6 a = 24 + 6 \times 2 = 36 m \end{array}$

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