Question

A trolley while going down an inclined plane has an acceleration of 2 cm per second what will be its velocity 3 seconds after the start

Answer 1

Here,

$a = 2 {cm \: s}^{ - 2 } \\ u = 0cm {s}^{ - 1} \\ t = 3s \\ v = ? \\ by \: using \: {1}^{st} equation \: of \: motion \\ we \: have \: v = u + at \\ = > v = 0 + 2 \times 3 \: cm {s}^{ - 1} \\ = > v = 6 \: cm {s}^{ - 1}$

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Answer 2

v = u + at

u = o, a = 2cm/sec^2, t= 3sec

put all the values in above formula,

v= 0+ 2×3 = 6 cm/sec