Question

what will be velocity of car at 40seconds

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Answer 1

Answer:

may be it is approximately 15m per second

Answer 2

Answer:

graph shows uniform acceleration of

$\frac{20 - 15}{10} = \frac{1}{2} \frac{m}{ {s}^{2} }$

$using \: \: the \: formula \\ a = \frac{v - u}{t} \\ where \: v = 20m \: per \: sec \\ u = 15 \: m \: per \: sec \\ t = 10sec$

we also know that

$a = \frac{v}{t} \\ thus \: v = at \\ v = \frac{1}{2} \times 40 = 20 \frac{m}{sec}$

hence the velocity of car at 40 s will be 20 m/sec