First slide

Instantaneous acceleration

Question

A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds. The velocity of the body at the end of the 7^th second is

Easy

A

10cm s^-1
B

20cm s^-1
C

5cm s^-1
D

30cm s^-1

Solution

$\begin{array}{l} S_{1} = U (2) + \frac{1}{2} a (2)^{2} s_{1} = 200 m \\ S_{1} + S_{2} = U (6) + \frac{1}{2} a (6)^{2} S_{2} = 220 m \end{array} U = 115 cm / s a = - 15 cm / s^{2} v = U + at when t = 7 V = 10 cm / s$

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