Question

solve this numerical question

Answer 1

u = 30m/s

t = 4s

g= -10m/s^2( taking downwards as -ve)

$s = ut + \frac{1}{2} ( - g) {t}^{2}$

$s = 30 \times 4 + \frac{1}{2} \times - 10 \times 4 \times 4 \\ = 120 - 80 \\ = 40m$