Question

A particle moves in straight line with constant acceleration. It changes its velocity from 10m/s to 20m/s while passing through a distance 135 m in t sec. The value of t is

Answer 1

u = 10m/s

v = 20m/s

S = 135m

$v {}^{2} = u {}^{2} + 2as$

400 = 100 + 2×a×135

300 = 270a

a = 10/9

v = u + at

20 = 10 + 10t/9

10 = 10t/9

t = 90/10 = 9 seconds

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