Question

a particle moving with an initial velocity of 5.0 m/s is subjected to a uniform acceleration of -2.5 m/s2 . find the displacement in next 4.0 sec .

Answer 1

using second equation of uniformly accelerated motion,

$s = ut + \frac{1}{2} a {t}^{2} \\ s = 5 \times 4 + \frac{1}{2} \times - 2.5 \times 16 \\ s = 20 + (- 10.0) \\ s = 20 - 10 \\ s = 10 \: metres.$
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