Question

if a body is thrown vertically upward at the speed of 10 m/s then after how much time and with what velocity will it reach back to us

Answer 1

$s = ut + \frac{1}{2}a {t}^{2} \\ 0 = 10t + \frac{1}{2} \times 10 \times {t}^{2} \\ t = 0 \: or \: 2 \\ answer \: is \: 2$