A ball is thrown vertically upward with an initial velocity of \( 150 \, \text{m/s} \). The ratio of velocity after \( 3 \, \text{s} \) and \( 5 \, \text{s} \) is \( \dfrac{x+1}{x} \). The value of \( x \) is_____. (take, \( g = 10 \, \text{m/s}^{2} \))
