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1st Equation of Motion

Question

A body travels $200 m$ in the first two second and $220 m$ in the next four second. The velocity at the end of the seventh second from the start will be

A

10

m s^{- 1}

B

15

m s^{- 1}

C

220

m s^{- 1}

D

5

m s^{- 1}

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Solution

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$200 = u (2) + \frac{1}{2} \times a (2)^{2} = 2 u + 2 a = 200$
$\Rightarrow u + a = 100 - (1)$

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