Abus travelling on a straight road at 25m/s accelerates uniformly at 5m/s squared for 2 seconds. find its speed in kilometres per hour

126 kmh⁻¹

Explanation:

We can simply solve this by applying motion equations

where  

v - final velocity

u - initial velocity

a-acceleration

t - time

v = u + at

  = 25 + 5×2 = 35 ms⁻¹

  = (35/1000)×3600 = 126 kmh⁻¹

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one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.